University of the Witwatersrand New Testament scholar Professor Albert S. Geyser later admitted that he had leaked the documents. Naudé had given the documents to Geyser to evaluate the extent of the influence of the Broederbond on the church. Geyser then provided the information to a journalist at The Sunday Times. The book " The Super-Afrikaners. Inside the Afrikaner Broederbond " written by Ivor Wilkins and Hans Strydom published in 1978 exposed a name list of possible members of the Broederbond. The source of these documents, that was taken without authorization, was blamed on Naudé. In 1967 Naudé and Geyser won a libel case against conservative Pretoria Professor Adriaan Pont, who had called them communists. In 1970 Naudé was among few white South African Christian leaders "who openly called for understanding of the WCC decision" to provide financial support for liberation movements in southern Africa. "If blood runs in the streets of South Africa it will not be because the World Council of Churches has done something but because the churches of South Africa have done nothing," Naudé said. In response, the state formed the Schlebusch Commission in 1972 to investigate anti-apartheid Christian organizations. When Naudé refused to testify, he was tried and imprisoned. After a night in the cells, a DRC minister paid his fine. During a 1972 trip to Germany and Britain, Naudé preached at Westminster Abbey, "the first Afrikaans theologian to be so honoured". In 1973 the state withdrew his passport, but temporarily returned it in 1974 so that he could travel to the University of Notre Dame, South Bend, Indiana USA, to receive the Reinhold Niebuhr Award for justice and peace. As the CI increasingly incorporated black African radicals like Steve Biko, Naudé had to bear the brunt of harassment by the state security police. The state eventually forced the CI to close in 1977. Banning and the SACC From 1977 to 1984 the South African government "banned" Naudé – a form of house arrest with severe restrictions on his movements and interactions. For example, he could not be in the same room with more than one other person. Other leaders of the Christian Institute suffered the same fate, including Brian Brown, Cedric Mayson, and Peter Randall. Although under constant police surveillance, Naudé managed to secretly help anti-apartheid resistors move around and out of South Africa by providing them with old vehicles that he had repaired