Tobin led the Teamsters in a series of raids against the United Brewery Workers for the next several years. Both unions also fought over the same workers in numerous organizing campaigns. The United Brewery Workers affiliated with the CIO in July 1946 to try to marshal enough resources to stop the raids. A major dispute broke out on September 1946 in Pittsburgh, Pennsylvania. Both unions engaged in jurisdictional strikes against one another. Beatings, riots and bombings occurred in Pittsburgh, Philadelphia, New Jersey and Ohio. Fears grew that the labor war would spread across the country. An NLRB election held in 1949 was won by the United Brewery Workers and defused the tense situation, but raiding continued for the next 20 years.