Teamsters are trying to organize workers at Coors.

The Teamsters’ game plan is to get 30% of the 3,400 workers at the Adolph Coors Co. brewery to sign cards authorizing the union to seek an election handled by the National Labor Relations Board. If the Teamsters union wins a simple majority at the secret ballot election, the union would gain representation rights. Coors workers haven’t had union representation in 10 years, since Brewery Workers Local 366 struck Coors in 1977. Coors, headquartered in Golden, Colo., responded by replacing the striking workers, and the AFL-CIO called a national boycott of Coors beer.