To me the answer to the question "is it possible to be a communist without Marx" is obvious. Not possible, no way, no how, not really. I guess, in fact I know, there are people out there who say it is, but I ain't buying. We aren't talking primitive times and primitive societies here. Anyway, what follows below is from Antonio Negri and comes to us from the web site known appropriately as Negri In English and is Scission's Theoretical Weekends presentation.
PS: I had to go through and create the paragraphs because of the way the paper was laid out. I may have messed up somewhere, but I am sure you will forgive me.