Russian Criminal Tattoos is a Tumblr blog headed by Danzig Baldaev, a prominent authority on Russia's lawless underworld. As a former prison guard, Danzig encountered more than his fair share of ruthless felons, and for the past 30 years, Baldaev has been documenting symbolic emblems immortalized on the skin of Russia's most hard-hardened criminals. Vulgar, salacious, and filled with plenty of finds you probably shouldn't pull up at work, hit the thumbs for a detailed look inside the Russian Criminal Tattoo archives. 

[via Russia Criminal Tattoos]