Throw in trots as well. Arguably, after MLs, Maoists probably are the most successful, at least because their struggles aren’t disintegrating into splinters instead of fighting their peoples wars. Also, Nepal was arguably a successful revolution that simply fell to opportunism.

Anarchists, Trots, and Leftcoms have barely had a whiff of any kind of established power let alone a successful revolution.

For that I’ll give the Maoists their due credit.