Secondary Boycott Law and Legal Definition

A secondary boycott is an unfair labor practice in which a union attempts to strike a neutral third party in order to put pressure on the company that is involved in a certification or de-certification action. It usually involves an organized refusal to purchase the products of, do business with or perform services for (such as deliver goods) a company which is doing business with another company where the employees are on strike or in a labor dispute.

Secondary boycotts are illegal under the federal Taft-Hartley Act and the Landrum-Griffin Act . Many states also have laws, which vary by state, prohibiting secondary boycotts.