You don’t know anything about stallman if you don’t think he’s a leftist. Go to his website, he links the green party website right across the top.
It doesn't matter. The free software movement is if anything implemented socially and by code in a bottom up fashion, which is the opposite of command and control communism. Stallman doesn't own the code and he can't say who can use it. For every RMS there is an ESR who is a hard core gun loving libertarian.