Random said:To the leninists who've posted on this thread: Do members of DC parties disagree with this statement these days?
It's a quote that is much abused. But what it's actually saying is that if a mass workers' party is in place, and you're a socialist, then you're for the party. You can say that it is wrong "on certain specific issues or at certain moments" - a very important clarification! But if you think that the party as a concept is wrong, then you're an anarchist, a counter-revolutionary, or whatever, or you believe that it no longer represents the leadership of the working class - as Trotsky later came to see the CPGB. He rather overlooks this last possibility, of a bureaucratic coup, in this statement.
Of course, this only applies to a mass workers' party. It's quite possible to believe that any or all of the small groups which exist in this country are on the wrong course and still be a Trotskyist.