If you have any good reading suggestions, please let me know.
I don't want to look like I'm spreading left wing propaganda, so the easiest way to go about it, is to look over at some of the DUmmies complaints about the World workers party, go to their websites also, the various Daily Kos sites, and some of the moveon stuff.
They all have various gripes with various factions.
Thats before you even get into the numerious marxist websites out there on the web.
I had alot of college lefty professors back in the day, thank the good lord they never managed to brainwash me.
If you look at some of the different enviornmentalist groups, they have differences with each other...and natural conflicts with labor groups....who have conflicts with agricultural groups....who have conflicts with nationalist groups, and every marxist group has its own variations.
You could also look up the phrase "libertarian-socialist" and see how many of them are anarchists, and why they have problems with the marxists.
These left wing rallys and summits are basically coalitions.