On 28th April 1967, during the ongoing war in Vietnam, American heavyweight boxing champion Muhammad Ali was due to be inducted into the US Armed Forces. When his name was called, Ali refused to come forward. Again he was called and again, he held his ground. With his third refusal, an officer warned Ali that he was committing a felony punishable by up to five years in prison and a $10,000 fine. Called to step forward once more, Ali maintained his resistance and was subsequently arrested. His title and license to box were stripped in the same day. Found guilty of violating Selective Service laws in June, Ali was unable to fight professionally for three years while the conviction was disputed in the courts. As an outspoken conscientious objector, ‘the Greatest’ became a figurehead for the growing civil rights and anti-war movements, with his conviction eventually overturned in 1971. This 1970 image show Ali at the centre of it all, walking with members of the Black Panther Party in Ne...