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strike may be unlawful because an object or purpose of the strike is unlawful. A strike in support of a union unfair labor practice or one that would cause an employer to commit an unfair labor practice may be a strike for an unlawful object. For example, it is an unfair labor practice for an employer to discharge an employee for failing to make certain lawful payments to the union when no union-security agreement is in effect. A strike to compel an employer to do this would be a strike for an unlawful object and, therefore, an unlawful strike.
Section 8(b)(4) of the NLRA prohibits strikes for certain objects even though they are not necessarily unlawful if achieved by other means. An example of this would be a strike to compel Employer A to cease doing business with Employer B. It is not unlawful for Employer A voluntarily to stop doing business with Employer B, and it is not unlawful for a union merely to request that it do so. It is unlawful for the union to strike with an object of forcing the employer to do so. Employees who participate in an unlawful strike may be discharged and are not entitled to reinstatement. See Unfair Labor Practice Charges for more information on unlawful strikes.