N.W.A. (Niggaz with Attitude) was a Compton, California-based hip hop group widely considered one of the seminal acts of the gangsta rap sub-genre. Active from 1986 to 1991, the group endured controversy due to the explicit nature of their lyrics. They were subsequently banned from many mainstream U.S. radio stations and even at times prevented from touring - yet the group has still sold over 9 million units in the U.S. alone. Their second album, Straight Outta Compton, marked the beginning of the new gangsta rap era as the production and the social commentary in their lyrics were revolutionary within the genre. Rolling Stone ranked N.W.A. eighty-third on their list of the "100 Greatest Artists of All Time".Although largely unknown at the group's inception, rappers Dr. Dre, Ice Cube, Eazy-E, MC Ren, and The D.O.C. would all go on to be platinum-selling stars as solo artists.