Yes, the Muslim Brotherhood is violating human rights in Libya, because they killed Americans. The Muslim Brotherhood was behind the attack in Libya on September 11. They will kill anyone that they think they need to in order to take over the world, and that includes violating human rights in Libya. That situation is tragic and unacceptable.
I don't know a whole lot about this issue, but from what I understand they are committing acts of violence on innocent people. This would be a blatant human rights violation because they are hurting people who have done nothing to them. They are also dragging dead bodies around in the streets and causing trouble.