Definitely. Unions brought progress in terms of worker rights, up to a point. They helped transform the landscape for all workers.

But, like all big and complex organizations they become corrupted and rather than having the interest of workers and society as foremost goals, self perpetuation and preservation become the goals.

Except for Bernie no other candidate explicitly and implicitly supports unions. All the others support policies which would undermine unions, except for where it’s politically expedient.

But this is natural. Even in the proletarian era of Mao, unions/workers suffered descent too. Often a most favored group would be pitted against another when necessary, for example the Hong Wei Bings [紅衛兵]