Witnesses say that police officers shut down Mos' sound system and aggressively removed him from the stage, citing him for performing without a permit.  Mos was performing "Katrina Clap," a song about the victims of hurricane Katrina and the inadequate rescue efforts of the U.S. government.

Regarded by many as one of the most talented MCs in Hip Hop, Mos has also established himself as an accomplished actor, landing memorable roles in films like "The Italian Job," "Brown Sugar," "Monster Ball," and "16 Blocks."  Mos was also nominated for an Emmy Award for his role as Vivian Thomas in the HBO film "Something The Lord Made."  Mos is also the host of HBO's popular slam poetry program "Russell Simmons' Def Poetry."

In spite of all of his acting success, Mos Def will always be a Real MC at heart.  Known for his freestyle skills, Mos has always addressed social and political issues in his rhymes.  He is scheduled to release his final album on a major label,  "Tru3 Magic," later this year.