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In short
A strike is illegal if it is declared/undertaken without complying with the Labor Code’s procedural conditions (bargaining deadlock/unfair labor practice notice and voting; cooling-off/strike ban requirements; and valid authority/assumption rules), particularly if it proceeds despite an order automatically enjoining it (Labor Relations, Article 278(g) and Article 279(a); Allied Banking Corporation v. NLRC, G.R. No. 116128).
Explanation
- Determine whether the “strike” is legally grounded at all
- A strike may be declared only in the allowed grounds: bargaining deadlocks and unfair labor practices. (Labor Relations, Article 278(b) and Book V, Rule XXII, Section 5)
- A strike is not allowed on inter-union or intra-union disputes. (Labor Relations, Article 278(b); Book V, Rule XXII, Section 5)
- Even if there is a violation of a collective bargaining agreement, it is not “unfair labor practice” (and thus not strikeable) unless it is “flagrant and/or malicious refusal to comply with its economic provisions.” (Book V, Rule XXII, Section 5)
- Check the procedural prerequisites before declaration/starting
- Collective bargaining first: “No labor organization or employer shall declare a strike or lockout without first having bargained collectively...” (Labor Relations, Article 279(a))
- Mandatory notice requirement and timing:
- Bargaining deadlocks: notice at least 30 days before the intended date. (Labor Relations, Article 278(c))
- Unfair labor practice: notice period is 15 days. (Labor Relations, Article 278(c))
- Implementing detail (regional filing/copy service): at least 30 days for deadlocks; 15 days for unfair labor practice. (Book V, Rule XXII, Section 7)
- Cooling-off / mediation and the “strike right” arises only after the waiting period:
- During cooling-off, the Ministry must mediate/conciliate. (Labor Relations, Article 278(e))
- Only if the dispute remains unsettled until lapse of the requisite days from mandatory filing may the labor union strike. (Labor Relations, Article 278(e))
- Strike vote and membership approval:
- Strike decision must be approved by a majority of total union membership in the bargaining unit concerned, by secret ballot in meetings or referenda. (Labor Relations, Article 278(f))
- The union must furnish the Ministry the voting results “at least seven days before the intended strike” and it remains “subject to the cooling-off period.” (Labor Relations, Article 278(f))
- Strike ban period (timing effect after results are received):
- The strike ban period is “seven (7) days from receipt of the results of strike/lockout vote,” excluding the first day and including the last. (Book VII, Rule VI, Section 3)
- For certain “union-busting” dismissals of duly elected union officers, the cooling-off period “shall not apply,” but the union may take action immediately only subject to the 7-day strike ban period. (Labor Relations, Article 278(c); Book VII, Rule IV, Section 7(a))
- Check who may declare the strike (authority to call it)
- A “certified or duly recognized bargaining representative” may declare a strike in bargaining deadlocks and unfair labor practices. (Book V, Rule XXII, Section 6)
- If there is no certified/duly recognized bargaining representative, a “legitimate labor organization” in the establishment may declare a strike but only for unfair labor practices. (Book V, Rule XXII, Section 6)
- Check the “automatic injunction”/no-declaration periods that make a strike illegal if violated
- After assumption/certification/submission, a strike cannot be declared:
- “No strike or lockout shall be declared after assumption of jurisdiction by the President or the Minister or after certification or submission of the dispute to compulsory or voluntary arbitration or during the pendency of cases involving the same grounds...” (Labor Relations, Article 279(a))
- The implementing rule similarly says “Neither will a strike be declared after assumption... or ... during the pendency of cases involving the same grounds...” (Book V, Rule XXII, Section 5)
- Industries indispensable to the national interest:
- Secretary of Labor assumption/certification “shall have the effect of automatically enjoining the intended or impending strike or lockout...” (Labor Relations, Article 278(g))
- If a strike has already taken place, strikers must immediately return to work. (Labor Relations, Article 278(g))
- Hospitals and similar medical institutions (heightened restriction):
- Strikes “shall, to every extent possible, be avoided,” and the Secretary may assume jurisdiction within 24 hours and issue orders/injunctions that the parties must comply with under “pain of immediate disciplinary action...” (Labor Relations, Article 278(g))
- What makes the strike “illegal” in practice (effect and consequences)
- A strike that proceeds in spite of an assumption/certification order is “prohibited” and “thus illegal.” (Allied Banking Corporation v. NLRC, [CASE HOLDING], G.R. No. 116128)
- If a certified/imposed status exists, non-compliance with the certification order is treated as an illegal act in the course of the strike, triggering enforcement and disciplinary/relief consequences. (Book VII, Rule VIII, Section 4)
- Separately from “timing legality,” unlawful strike-related acts (violent/illegal picketing; strikebreaking) also trigger labor-law prohibitions. (Labor Relations, Article 279(b), (c), (d), (e); Article 279(a) on loss of employment status for knowing participation in illegal acts during an illegal strike)
- a constitutional provision is among the sources and controls over any conflicting statute
"(a) It is the policy of the State to encourage free trade unionism and free collective bargaining. (b) Workers shall have the right to engage in concerted activities for purposes of collective bargaining or for their mutual benefit and protection. The right of legitimate labor organizations to strike and picket and of employers to lockout, consistent with the national interest, shall continue to be recognized and respected. However, no labor union may strike and no employer may declare a lockout on grounds involving inter-union and intra-union disputes. (c) In cases of bargaining deadlocks, the duly certified or…
"(a) No labor organization or employer shall declare a strike or lockout without first having bargained collectively in accordance with Title VII of this Book or without first having filed the notice required in the preceding Article or without the necessary strike or lockout vote first having been obtained and reported to the Ministry. No strike or lockout shall be declared after assumption of jurisdiction by the President or the Minister or after certification or submission of the dispute to compulsory or voluntary arbitration or during the pendency of cases involving the same grounds for the strike or lockout.…
“The right of legitimate labor organizations to strike and picket and of employers to lockout, consistent with the national interest, shall continue to be recognized and respected.”
“However, no labor union may strike and no employer may declare a lockout on grounds involving inter-union and intra-union disputes.”
“In cases of bargaining deadlocks, the duly certified or recognized bargaining agent may file a notice of strike or the employer may file a notice of lockout with the Ministry at least 30 days before the intended date thereof. In cases of unfair labor practice, the period of notice shall be 15 days and in the absence of a duly certified or recognized bargaining agent, the notice of strike may be filed by any legitimate labor organization in behalf of its members.”
“However, in case of dismissal from employment of union officers duly elected in accordance with the union constitution and by-laws, which may constitute union busting where the existence of the union is threatened, the 15-day cooling-off period shall not apply and the union may take action immediately.”
“During the cooling-off period, it shall be the duty of the Ministry to exert all efforts at mediation and conciliation to effect a voluntary settlement.”
“Should the dispute remain unsettled until the lapse of the requisite number of days from the mandatory filing of the notice, the labor union may strike or the employer may declare a lockout.”
“The notice must be in accordance with such implementing rules and regulations as the Minister of Labor and Employment may promulgate.”
“A decision to declare a strike must be approved by a majority of the total union membership in the bargaining unit concerned, obtained by secret ballot in meetings or referenda called for that purpose.”
“In every case, the union or the employer shall furnish the Ministry the results of the voting at least seven days before the intended strike or lockout, subject to the cooling-off period herein provided.”
“When, in his opinion, there exists a labor dispute causing or likely to cause a strike or lockout in an industry indispensable to the national interest, the Secretary of Labor and Employment may assume jurisdiction over the dispute and decide it or certify the same to the Commission for compulsory arbitration. Such assumption or certification shall have the effect of automatically enjoining the intended or impending strike or lockout as specified in the assumption or certification order.”
“If one has already taken place at the time of assumption or certification, all striking or locked out employees shall immediately return to work and the employer shall immediately resume operations and readmit all workers under the same terms and conditions prevailing before the strike or lockout.”
“Before or at any stage of the compulsory arbitration process, the parties may opt to submit their dispute to voluntary arbitration.”
“The Secretary of Labor and Employment, the Commission or the voluntary arbitrator or panel of voluntary arbitrators shall decide or resolve the dispute within thirty (30) calendar days from the date of the assumption of jurisdiction or the certification or submission of the dispute, as the case may be.”
“The decision of the President, the Secretary of Labor and Employment, the Commission or the voluntary arbitrator shall be final and executory ten (10) calendar days after receipt thereof by the parties.”
“A strike or lockout may be declared in cases of bargaining deadlocks and unfair labor practices.”
“Violations of collective bargaining agreements, except flagrant and/or malicious refusal to comply with its economic provisions, shall not be considered unfair labor practice and shall not be strikeable.”
“No strike or lockout may be declared on grounds involving inter-union and intra-union disputes or without first having filed a notice of strike or lockout or without the necessary strike or lockout vote having been obtained and reported to the Board.”
“Neither will a strike be declared after assumption of jurisdiction by the Secretary or after certification of submission of the dispute to compulsory or voluntary arbitration or during the pendency of cases involving the same grounds or the strike or lockout.”
“No labor organization or employer shall declare a strike or lockout without first having bargained collectively in accordance with Title VII of this Book or without first having filed the notice required in the preceding Article or without the necessary strike or lockout vote first having been obtained and reported to the Ministry.”
“No strike or lockout shall be declared after assumption of jurisdiction by the President or the Minister or after certification or submission of the dispute to compulsory or voluntary arbitration or during the pendency of cases involving the same grounds for the strike or lockout.”
“Any worker whose employment has been terminated as a consequence of any unlawful lockout shall be entitled to reinstatement with full backwages.”
“Any union officer who knowingly participates in an illegal strike and any worker or union officer who knowingly participates in the commission of illegal acts during a strike may be declared to have lost his employment status: Provided, That mere participation of a worker in a lawful strike shall not constitute sufficient ground for termination of his employment, even if a replacement had been hired by the employer during such lawful strike.”
“In bargaining deadlocks, a notice of strike or lockout shall be filed with the regional branch of the Board at least thirty (30) days before the intended date thereof, a copy of said notice having been served on the other party concerned. In cases of unfair labor practice, the period of notice shall be fifteen (15) days.”
“However, in case of unfair labor practice involving the dismissal from employment of any union officer duly elected in accordance with the union constitution and by-laws which may constitute union-busting where the existence of the union is threatened, the fifteen-day cooling-off period shall not apply and the union may take action immediately after the strike vote is conducted and the results thereof submitted to the appropriate regional branch of the Board.”
The cooling-off period for bargaining deadlocks is thirty (30) days, and for unfair labor practices, it is fifteen (15) days. (Paraphrased from Book VII, Rule IV, Section 7(a))
“However, in case of unfair labor practice involving the dismissal from employment of union officers duly elected in accordance with the union constitution and by- laws, which may constitute union-busting where the existence of the union is threatened, the 15 day cooling-off period shall not apply and the union may take action immediately after the strike vote is conducted and the results thereof submitted to the Regional Branch of the Board, subject to the 7-day strike ban period.”
“The cooling-off period shall be reckoned from the date of receipt of the notice by the Regional Branch. In determining the period, the first day shall be excluded and the last day included.”
“The strike ban period shall be counted seven (7) days from receipt of the results of strike/lockout vote. In determining the period, the first day shall be excluded and the last day included.”
“Any certified or duly recognized bargaining representative may declare a strike in cases of bargaining deadlocks and unfair labor practices.”
“The employer may declare a lockout in the same cases.”
“In the absence of a certified or duly recognized bargaining representative, any legitimate labor organization in the establishment may declare a strike but only on grounds of unfair labor practices.”
“When a labor dispute causes or is likely to cause a strike or lockout in an industry indispensable to the national interest, the Secretary of Labor and Employment may assume jurisdiction over the dispute and decide it or certify the same to the National Labor Relations Commission for compulsory arbitration, provided, that any of the following conditions is present: ...”
“Such assumption shall have the effect of automatically enjoining an impending strike or lockout.”
“If a strike/lockout has already taken place at the time of assumption, all striking or locked out employees and other employees subject of the notice of strike shall immediately return to work and the employer shall immediately resume operations and readmit all employees under the same terms and conditions prevailing before the strike or lockout.”
“Upon certification, the intended or impending strike or lockout is automatically enjoined, notwithstanding the filing of any motion for reconsideration of the certification order nor the non-resolution of any such motion which may have been duly submitted to the Office of the Secretary of Labor and Employment.”
“If a work stoppage has already taken place at the time of the certification, all striking or locked out employees shall immediately return to work and the employer shall immediately resume operations and readmit all workers under the same terms and conditions prevailing before the strike or lockout.”
“Non-compliance with the certification order of the Secretary of Labor and Employment shall be considered as an illegal act committed in the course of the strike or lockout, and shall authorize the Commission to enforce the same under pain of immediate disciplinary action, including dismissal or loss of employment status or payment by the locking-out employer of backwages, damages and/or other affirmative relief, even criminal prosecution against the liable parties.”
(In hospitals, clinics, and similar medical institutions) “In line with the national concern for and the highest respect accorded to the right of patients to life and health, strikes and lockouts in hospitals, clinics and similar medical institutions shall, to every extent possible, be avoided...” (Labor Relations, Article 278(g))
“In such cases, therefore, the Secretary of Labor and Employment may immediately assume, within twenty four (24) hours from knowledge of the occurrence of such a strike or lockout, jurisdiction over the same or certify it to the Commission for compulsory arbitration.”
“For this purpose, the contending parties are strictly enjoined to comply with such orders, prohibitions and/or injunctions as are issued by the Secretary of Labor and Employment or the Commission, under pain of immediate disciplinary action...”
“No public official or employee, including officers and personnel of the New Armed Forces of the Philippines or the Integrated National Police, or armed person, shall bring in, introduce or escort in any manner, any individual who seeks to replace strikers...”
“No person engaged in picketing shall commit any act of violence, coercion or intimidation or obstruct the free ingress to or egress from the employer's premises for lawful purposes, or obstruct public thoroughfares.”
(Also relevant to “strike” conduct) “No person shall obstruct, impede, or interfere with by force, violence, coercion, threats or intimidation, any peaceful picketing...” (Labor Relations, Article 279(b))
“No employer shall use or employ any strike-breaker, nor shall any person be employed as a strike-breaker.”
Limits of the sources
- The sources do not provide the complete set of rules for picketing conduct beyond the prohibitions quoted (e.g., additional spatial/operational rules not included), so only the quoted constraints are covered.
- The “strike illegal” label can depend on additional factual timing (when notice was filed, when vote results were received by the Board/Ministry, when cooling-off and strike ban periods ran, and whether/when an assumption/certification order issued). This answer explains the legal checkpoints but cannot determine which branch applies without those dates/timing facts.
Laws retrieved
Everything retrieval surfaced, not only what the answer relied on. Read the ones it quotes.
- Article 278, Labor Relations
- Section 5, Issuances of the Department of Labor and Employment and its Attached Agencies
- Article 279, Labor Relations
- Section 7, Issuances of the Department of Labor and Employment and its Attached Agencies
- Section 10, Issuances of the Department of Labor and Employment and its Attached Agencies
- Section 3, Issuances of the Department of Labor and Employment and its Attached Agencies
- Section 6, Issuances of the Department of Labor and Employment and its Attached Agencies
- Section 15, Issuances of the Department of Labor and Employment and its Attached Agencies
- Section 4, Issuances of the Department of Labor and Employment and its Attached Agencies
- Section 31, The Magna Carta of Public Health Workers
- Article 280, Labor Relations
- Article 219, Labor Relations
- Section 3, The 1987 Constitution of the Republic of the Philippines
- Section 13, Issuances of the Department of Labor and Employment and its Attached Agencies
- Section 11, Issuances of the Department of Labor and Employment and its Attached Agencies
- Section 12, Issuances of the Department of Labor and Employment and its Attached Agencies
“A strike that is undertaken despite the issuance by the Secretary of Labor of an assumption or certification order becomes a prohibited activity and thus illegal.”
“The union cannot feign ignorance of this legal mandate. It is the law and compliance therewith cannot be excused...”
“An assumption and/or certification order of the Secretary of Labor automatically results in a return-to-work of all striking workers, whether or not a corresponding order has been issued by the Secretary of Labor. Once an assumption/certification order is issued strikers are enjoined, or if one has already taken place, all strikers shall immediately return to work.”
A strike staged despite the issuance by the Secretary of Labor of an assumption or certification order is considered illegal, and strikers are required to return to work immediately. (Paraphrased from Allied Banking Corporation v. National Labor Relations Commission, [CASE HOLDING], G.R. No. 116128)
Cases retrieved
Everything retrieval surfaced, not only what the answer relied on. Read the ones it quotes.