The cancer infecting the political Left

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Unions in general are class collaborations organizations- I'd refer you for example to the AFL-CIOs support for the Vietnam War.

Here's Paul Mattick on unions:

Quote: Under conditions which preclude a sufficient capitalist accumulation, that is, under conditions of economic crisis, the reformist activities of political parties and trade unions cease to be operative and these organisations abstain from their supposed functions, as they would now endanger the capitalist system itself. They will rather try to help sustain the system, up to the point of directly sabotaging the workers aspirations for better living and working conditions. They will help capitalism overcome its crisis at the expense of the workers. In such a situation, the workers, unwilling to submit to the dictates of capital, are forced to resort to activities not sanctioned by official labor organisations, to so-called wildcat strikes, factory occupations and other form of direct actions outside the control of the established labor organisations. These self-determined activities, with their temporary council structure, indicate the possibility of their radical application under arising revolutionary situations, replacing the traditional organisational forms, which have become a hindrance for both the struggle for immediate needs and for revolutionary goals.

The goal of socialism is the abolition of the system of wage labor (one reason that the Soviet Union was not socialist). The trade union bureaucracies, whose task it is to mediate this system, naturally fights against it.