What is a Rap group starting with NW?

The rap group you're referring to is N.W.A, which stands for Niggaz Wit Attitudes. Formed in the late 1980s, they are often credited with popularizing West Coast hip-hop and gangsta rap. Their groundbreaking album "Straight Outta Compton" featured hard-hitting lyrics that addressed social issues and life in Compton, California. N.W.A included influential members such as Dr. Dre, Ice Cube, and Eazy-E.