Sorry for my bad English, not a native speaker.
As all of you probably know(as if you keep track on things) the situation in Russia is pretty complicated on the left side.
There are different groups with different ideologies everywhere. But in recent few years it all came to this:
ROT FRONT (RKRP) formally the most massive organization and mostly dead now. By a high degree of ideological strategical maneuvering this biggest opposition communist party lost everything. From 300k members on a peak they now have hardly five hundred. Half of this five hundred is Trotskiest and another half is right-wing-Stalinist. Legal, but does not participate in the current elections due to the lack of active members. rotfront.su
Proriv (Breakthrough) formally an elite division of ROT FRONT (RKRP) expelled from RKRP by Trotskiests for elitism. Formed a theoretical journal within RKRP. Marxist-Leninist. Keeps developing after expulsion for 15 years. Gaining popularity within radical Russian left. Targeting academical theory learning and academical intellectuals. Heavily authoritarian. proriv.ru
Skepsis (Skepticism) social-democratic Soros propaganda with grants. Uses Russian academics to publish theoretical articles, drugs reader to the right in a very subtle way. scepsis.net
I personally like Proriv the most, because nobody is better in theory in the whole world. You can read one of Proriv's articles here communist-ml.ru
You can ask me questions on the article, thread or on politics in Russia.