The dude with a head in his hand represents a black guy who killed a white guy out of jealousy (and for his wallet).
The thing with titties and a knife represents woman who tempts man for the great Satan (and cheats on her husband with the black guy).
The guy in the barrel is the poor schmoe who was gonna hang the black guy from that there dang tree for sleeping with his wife before the black guy and the she-devil-hooker-slut tricked the white guy and now he's fucked.