Tonight on Off The Ball, we will be looking back on one of the most challenging periods of Muhammad Ali's illustrious boxing career.

The years after 1967, when the former heavyweight champion refused conscription to the United States armed forces and was stripped of his title, barely seeing any action in the ring in the next four years.

The interview below is from Firing Line with William F Buckley in 1968 and gives some context and insight to the era and Ali's decision: