After years of organizing Amazon workers and pressuring the company to bargain over wages and working conditions, two prominent unions are teaming up to challenge the online retailer. The partnership was made final in voting that ended on Monday after members of the Amazon Labor Union, the only union formally representing Amazon warehouse workers in the United States, voted overwhelmingly to affiliate with the 1.3-million-member International Brotherhood of Teamsters. The vote was overseen by the Amazon union. Leaders of both unions said the affiliation agreement would put them in a better position to challenge Amazon and would provide the A.L.U. will fight fearlessly to ensure Amazon workers secure the good jobs and safe working conditions they deserve in a union contract,” Sean O’Brien, the Teamsters president, said in a statement early Tuesday.

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Persons: “, fearlessly, ” Sean O’Brien Organizations: Amazon Labor Union, Brotherhood of Teamsters, Amazon, Teamsters, A.L.U Locations: United States, Staten Island