I have a leftist friend who's a historian writing a paper on how the right is so successful at organizing and why the left sucks at it. Trying to help them gather sources. The more scholary the better.
She's particularly looking at right wing paramilitary organizations (proud boys, 3%s ect) And why the left has trouble forming their own.
Edit: question might have been a bit ambiguous, we all know a lot of the basic reasons for this, what I need is the type of thing that can be used for an academic research paper. Interesting discussion is still good though so have at it.
They did this against socialists in municipal Pennsylvania politics in early 20th century. Prob other places too: https://journals.psu.edu/phj/article/view/23744/23513
When the Dems and repubs allied against the successful socialist government, they called them "fusionists"