An affiliation agreement between the Amazon Labor Union and the 1.3 million-member Teamsters signals an escalation in challenging the online retailer. Organized Labor, E-Commerce, Labor and Jobs, Delivery Services, Amazon Labor Union, Amazon.com Inc, International Brotherhood of Teamsters, O’Brien, Sean M, Smalls, Christian, Staten Island (NYC), Warehouses An affiliation agreement between the Amazon Labor Union and the 1.3 million-member Teamsters signals an escalation in challenging the online retailer. NYT > Business