Complete the following sentence: Balthazar Johannes "B. J". (also known as John Vorster) 13 December 1915 <unk> 10 September 1983) was a South African politician who served as the Prime Minister of South Africa from 1966 to 1978 and as the fourth State President of South Africa from 1978 to 1979. Vorster was known for his staunch adherence to apartheid, overseeing (as Minister of Justice) the Rivonia Trial in which Nelson Mandela was sentenced to life imprisonment for, and (as Prime Minister) the Terrorism Act, the complete abolition of non-white political representation, the
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