According to Wikipedia;
In addition to his status as a top-selling recording artist, Shakur was a promising actor and a social activist. Most of Shakur's songs are about growing up amid violence and hardship in ghettos, racism, problems in society and conflicts with other rappers. Shakur's work is known for advocating political, economic, social and racial equality, as well as his raw descriptions of violence, drug and alcohol abuse and conflicts with the law. Shakur was initially a roadie and backup dancer for the alternative hip hop group Digital Underground. Shakur's debut album, 2Pacalypse Now, gained critical recognition and backlash for its controversial lyrics.