The term 'outlaw' was first associated with country music after Waylon Jennings' 1972 hit Ladies Love Outlaws, but it stuck after the album Wanted! The Outlaws was released in 1976.
The album wasn't new material but packaged the talents of Waylon, Willie Nelson, Tompall Glaser and Jessi Colter and marked the recording industry's recognition of the changing times of country music.