A secondary boycott, also termed “secondary action” or a “sympathy strike”, refers to a strike posed by one company who seeks change by exerting pressure onto another company or business. Generally seen in labor or trade unions, a secondary boycott is usually the second measure taken when the first attempts at protest have been unsuccessful. Secondary boycotts have two main types. The first is a secondary consumer boycott, in which the union appeals to buyers in order to control the backing of a business. The second is a secondary employee boycott, in which the union discourages laborers from working for a particular company. Secondary boycotts are extremely limited, and in some cases completely illegal, such as in the United States, the UK, and Australia.