I mean communism is about a classless stateless society right? Workers unite, everyone is equal, from each according to his ability and all that.. Where in the ideology does it state LGBT groups don't fit this bill? I'm not using the not real commies excuse, I'm saying the fact they were communist and non inclusive of other members of the working class is contradictory.
You could say the same thing about capitalism. Or, hell, any other economic system. I see zero overlap between economics and LGBTQ. I'd love to hear a convincing argument otherwise, though.