When Ali was drafted for Vietnam, many questioned whether he would accept the induction.
Muhammad Ali defied the draft -- and polarized the nation -- 49 years ago today - Los Angeles Times
Canada remembers Muhammad Ali's mark on the country's sports history - The Globe and Mail
Thomas Boswell: Boxing talent, charm was the least of Ali – Reading Eagle
Muhammad Ali Refuses the Vietnam War Draft
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Muhammad Ali's letter to US Army seeking exemption from Vietnam war goes to auction
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Muhammad Ali Refuses the Vietnam War Draft
On this day in history, April 28, 1967, Muhammad Ali refuses to serve military at height of Vietnam War
When Muhammad Ali Refused to Go to Vietnam - The Atlantic
