A pivotal piece of history, Muhammad Ali’s unsigned Vietnam-era military draft card, which profoundly altered the boxing legend’s life and amplified the anti-war movement, is now set to go up for sale ...

This image provided by Christie’s Auction House shows Muhammad Ali's draft card. (Christie’s Auction House via AP) Muhammad Ali’s refusal to sign his Vietnam-era military draft card upended the boxing ...

Muhammad Ali's refusal to sign his Vietnam-era military draft card upended the boxing champ's life and added a powerful voice to the anti-war movement. Now that piece of history is coming up for sale.