In the last decade of Dubinsky's tenure some of these new members began to rebel, protesting their exclusion from positions of power within the union. That rebellion failed: the established leadership had too strong a hold on the official structure of the union, in an industry in which members were scattered across a number of small shops and in which power was concentrated in the upper echelons of the union, rather than in the locals. Without the support of a mass movement that would have given the majority an effective voice, individual insurgents were either marginalized or co-opted.