Common-Situs Picketing Law and Legal Definition

Common-situs picketing is an illegal picketing by union workers of a construction site as a result of a grievance held against a single subcontractor on the project.

The National Labor Relations Board allows common-situs picketing when it complies with certain tests. The use of separate entrances for employees represented by different unions may affect a union's right to strike on a common situs. If the striking union has its own separate entrance to the work site, then the union will be able to conduct a strike in front of that entrance. Strikes conducted in this manner are not considered to be secondary boycotts because they do not obstruct the employees of other employers from working.