Amazon’s delivery system depends on third-party companies. But labor regulators have challenged that model, possibly opening the way for unionization. Organized Labor, Delivery Services, Labor and Jobs, Amazon.com Inc, National Labor Relations Board, International Brotherhood of Teamsters, Regulation and Deregulation of Industry, Decisions and Verdicts Amazon’s delivery system depends on third-party companies. But labor regulators have challenged that model, possibly opening the way for unionization. NYT > Business