- An attempt to discourage dealing with a company that has business ties with another company facing a labor dispute, usually aimed at indirectly pressuring the employer to resolve the dispute. Illegal under the National Labor Relations Act
- The truck drivers' union launched a secondary boycott against the food supplier connected to the department store facing labor issues.
- After the shoe factory workers declared a strike, a secondary boycott targeted their leather supplier.
- The secondary boycott included attempts to discourage consumers from shopping at retailers connected to the grocery chain in dispute with its employees.