You mean maybe Lenin was right? (See his "Imperialism.")
In reality, it was the Communists above all others who prevented revolution in Spain. Later, when the Right Wing forces were in full control, the Communists showed themselves willing to go a great deal further than the Liberals in hunting down revolutionary leaders.[Snip]
Between the Communists and those who claim to stand to the Left of them there is a real difference. The Communists hold that Fascism can be beaten by alliance with sections of the capitalist class (the Popular Front); their opponents hold that this maneuver simply gives Fascism new breeding-grounds. The question has got to be settled; to make the wrong decision may be to land ourselves in for centuries of semi-slavery.