Secondary boycott

A secondary boycott is an attempt by labor to convince others to stop doing business with a particular firm because that firm does business with another firm that is the subject of a strike and/or a primary boycott. In the United States, secondary boycotts are frequently prohibited by the Taft-Hartley Act, which ammends the National Labor Relations Act of 1935, also known as the Wagner Act.

Because farm laborers in the United States are not covered by the Wagner Act, the United Farm Workers union has been able to legally use secondary boycotting of grocery store chains as an aid to their strikes against California agri-businesses and to their primary boycotts of California grapes and lettuce and wine. The UFW's secondary boycotts involved asking consumers to stop shopping at a grocery store chain until such time as the chain stopped carrying the boycotted grapes or lettuce or wine.

Secondary boycotting is frequently confused with secondary striking, which is also prohibited by the Taft-Hartley Act. Some legal definitions for secondary boycotting divide it into two different kinds, secondary consumer boycotts as per the above definition of secondary boycotts, and secondary employee boycotts, also defined as a secondary strike.