The 1959 Unlawful Organizations Act (UOA) outlawed certain organisations. It proscribed the Northern Rhodesian African National Congress and provided for the banning of additional organisations if their activities were deemed "likely" to disturb public order, "prejudice" the tranquility of the nation, endanger "constitutional government," or "promote feelings of ill will or hostility" between the races. Furthermore, the UOA outlawed any organisation that was "controlled by or affiliated to or participates in the activities or promotes the objects or propagates the opinions of any organization outside the colony". The executive's banning of an organisation was "not open to question in any court of law," and the burden of proving that one was not a member of a banned organisation fell on the accused. Attendance at a meeting or possession of books, writings, accounts, documents, banners, or insignia "relating to an unlawful organization" were prima facie evidence of membership "until the contrary is proved." Prosecution of such offences could be held in camera. Finally, the act provided for the complete indemnification of police and civil servants for actions connected with enforcing the measure. Between 1960 and 1965, 1,610 Africans were prosecuted and 1,002 convicted under this law.