In December 1956 Mandela and 155 political activists were arrested and charged with High Treason. Almost five years later, Justice Rumpff found all of the accused not guilty.
In the late 1950s Mandela became National President of the ANC Youth League. By 1959 the treason trial was still in progress. In the same year, the ANC planned an anti-pass laws campaign. The campaign was displaced when the Pan Africanist Congress (PAC), arranged mass anti-pass protests on 21 March 1960.
During one of the protests, the Sharpeville massacre occurred. This resulted with the banning of the ANC and the PAC and the government declared a state of emergency.