Who and What were the Left Peronistas?

[¿Que?]

I don't suppose I'll get too much response. In any case, I'm not looking for a drawn out discussion. Just a thoughtful answer to this question. We all know the right Peronistas were fascists. That's pretty obvious. But what about the left faction of Peronistas. I'm thinking like the Montoneros, but generally the kind of people that supported Peron from the left. Who were these people?