You do the Sweezy- Baran math

 MARXIST SWP(US) leader Morris Stein in 1941;

“We are monopolists in the field of politics. We can’t stand any competition. We can tolerate no rivals. The working class, to make the revolution can do it only through one party and one program.

This is the lesson of the Russian Revolution. That is the lesson of all history since the October Revolution. Isn’t that a fact?

This is why we are out to destroy every single party in the field that makes any pretence of being a working-class revolutionary party. Ours is the only correct program that can lead to revolution. Everything else is deception, treachery. We are monopolists in politics and we operate like monopolists.”