Unions often use secondary picketing in response to the subcontracting out of members' work during a strike.

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Secondary picketing, also known as sympathetic strike action or secondary action, is when workers strike in support of other workers who are already on strike, or engage in other forms of protest or disruption against a third party that is not their direct employer but has a relationship with their primary employer. Subcontracting out of members' work during a strike is one example of such a relationship, and unions may use secondary picketing to pressure the subcontractor to stop doing business with the primary employer until the labor dispute is resolved. However, secondary picketing is not always legal or effective, and may be subject to legal challenge or backlash from the public or other stakeholders.

Unions Often Use Secondary Picketing in Response to the Subcontracting