Thats
AKM (Vanguard of Red Youth). Nobody calls themselves 'Stalinists', but considering that every communist in Russia is a Marxist-Leninist (save for a few, of course, but its otherwise rather unthinkable), and Trotskyists just don't exist (so much for it being a western phenomenon), and hell, 80% of people have a positive view on Stalin, there is much more cooperation between communists-- however so while this is certainly not Nazbols (who now use a black and white flag, same design as Rjevan already said, though), AKM still works together with them in the Left Front, together with some other smaller communist groups, because NazBols are considered
left in Russia (eugh...but once again, the situation in Russia is much more different than the one in the West, and NazBols vary a lot between themselves, and no I don't approve of them- these 'Bolsheviks' just tend to like Stalin for the reasons the West hates Stalin, and you just don't see them say anything about Lenin or communism or anything (though once again, it varies). They are however, nationalists, plain and simple).
There is basically one major party (CPRF), a somewhat small but a very decent one (RCWP-RPC), and then the smaller ones (like youth groups) which basically work in this Left Front (not really a party), with all of these and anarchists basically taking part in the same demonstrations, because everybody knows who the main enemy is- Putin and United Russia.
Anyway, you should ask Soviet, he is in a different youth organization (the one of RCWP-RPC...or he is in the party itself, I don't remember), but he certainly knows more about these things than me, I haven't been in Russia for quite a while now.