Krasnaya Ruka is Russian
for "red hand
It doens't refer to anything, though I added it to one BattleTech fan artwork of mine (The Clans sometimes use Russian for some buzzwords, as Russian was Kerensky's mother tongue).
Perfect trolling tool, though: Referring to mythical non-existence like this is likely to make someone think "sounds like some communist ploy". When the meaning would be revealed, it'd sound like some sort of criminal organization formed by communists (One humorous horror story refers to "red hand", probably referring to hand prints of blood) or perharps some organization trying to catch criminals red-handed. Everyone can give their very own interpretation...