Slim Harry Shots is a Mob leader who ironically, ain't slim at all. He leads a large scale crime organization called the "Slim Mafia" where only 20% of the members in the crime organization are really slim.
His mobsters usually go after Mike and friends, usually intentionally or unintentionally for various reasons. Sometimes though, Harry actually helps Mike.
Despite all this, he is all for equality and dislikes hate groups like Nazis, the KKK, and RUC.