Solidarity action

Solidarity action (also known as secondary action, a boycott or a sympathy strike) is industrial action by a trade union in support of a strike initiated by workers in another, separate enterprise. The term "secondary action" is often used with the intention of distinguishing different types of trade dispute with a worker's direct employer, and so may be used to refer to a dispute with the employer's parent company, its suppliers, financiers, contracting parties, or any other employer in another industry.