Sports columnist Dave Zirin has written a new account of the career and politics of boxing legend Muhammad Ali. In his prime, Ali was an outspoken advocate of the Black Muslim movement and a critic of the Vietnam War. [includes rush transcript]

We end today with a new look at the boxing legend Muhammad Ali. Ali is considered the greatest boxer in the history of the sport. In his prime he was an outspoken advocate of the Black Muslim movement and a critic of the Vietnam War. He was sentenced to prison and stripped of his heavyweight title for refusing to fight in Vietnam.

• "When We Were Kings" - excerpt of Academy Award-winning documentary.

Sports columnist Dave Zirin has written a new account of Ali's career and his groundbreaking political involvement called "The Muhammad Ali Handbook." Zirin joins us in the firehouse studio.

• David Zirin, writes the weekly column Edge of Sports. He is a regular contributor to the Nation magazine and author of the "Muhammad Ali Handbook." His website is EdgeofSports.com.