Is it legal to strike or picket an employer?

Strikes and picketing are protected by the NLRA under certain conditions and to varying degrees. For important information on the rules regarding strike activity, see this Right to Strike page. A union cannot strike or picket an employer to force it to stop doing business with another employer who is the primary target of a labor dispute. At worksites with more than one employer, such as a construction site, picketing is only permitted if the protest is clearly directed exclusively at the primary employer.