There is more than one artist with this name:
1. A German jazz act.
2. A New York based Underground Hip-Hop group with Cage and Camu Tao. They produced only one self-titled album. Camu Tao has since passed away. The Nighthawks are named after the Sylvester Stalone and Billy Dee Williams movie featuring a white and black cop team. The Nighthawks album is a concept album about a white and black partnership of some really corrupt cops.
3. "The Nighthawks" are a blues and roots music band based in Washington, DC. Read more on Last.fm