Local 357, International Brotherhood of Teamsters, Chauffeurs, Warehousemen & Helpers v. National Labor Relations Board

Petitioner union (along with the International Brotherhood of Teamsters and a number of other affiliated local unions) executed a three-year collective bargaining agreement with California Trucking Associations, which represented a group of motor truck operators in California. The provisions of the contract relating to hiring of casual or temporary employees were as follows:

“Casual employees shall, wherever the Union maintains a dispatching service, be employed only on a seniority basis in the Industry whenever such senior employee^ are available. An available list with seniority status will…