You don’t know the half of it.
There is little unity in Leftist groups.
The way it works is, a committee decides on the direction the larger party will be going. There are directed debates and discussions and when a decision is made, you will not break party discipline or you will be expelled. Once expelled, you are persona non grata to those who are not expelled. Shunning isn’t as effective as the expulsion of a once party cadre.
There is no mystery why so many little Leftist groups exist. Factions and fractions leave, form their own little group, then they have some “internal struggle” on some issue and THEY fracture and split. It becomes an “eat your own” scenario. What fun!