Amusing Sign

I saw a sign similar to this in a shop window recently. I'd never seen it before and even though I don't agree with the authors of the quote, since I believe they were 'revolutionary socialists', nor do I agree with violence to achieve political ends, even good political ends, like re-instating a Catholic monarchy, I must say I thought it was a little amusing.

It is odd that someone who was so militantly Catholic has become the poster boy of the militant left. I wonder what he would, or perhaps does, make of it? He may have been subversive to the State but I doubt very much he would have had much time for Che Guevara.