Big time. The black guy who invented the "holiday" Kwanzaa from a jail cell was well noted for his crimes against blacks. In fact, he was in prison for torturing two black women who worked for him that he was convinced were trying to poison him. What's really weird is that this guy seemed really racist against blacks. He got along really well with prominent whites in the community and his crimes were almost exclusively against blacks.
That would be Ron Everett aka Maulana Karenga aka Ron Karenga, who was on the FBI payroll, when he wasn't doing time, and is now a tenured professor of Hate 101, at taxpayer expense. Somebody -- Annie Coulter? -- wrote an excellent annual Kwanzaa expose on him recently.