This is a very scarce South African movie, VHS quality. 1990, by Zastron.
It is based on a true story.
The movie is neither a political or war movie. It is a tough human drama told within the context of momentous events. An oath of blood divides the nation in South Africa a human drama takes place that could change the course of the Second World War. It is 1939, and the world is at war. Blacks and whites alike rush to join the Allied forces. But, thousands of Afrikaner patriots flock instead to an ultra-right wing organisation violently opposed to the British. Suddenly brother is against brother.
The Nazis, desperately short of strategic war materials, turn their attention to the only alternative source – South Africa. Hitler personally orders an operation to gain control of the country. He meets the South African boxing champion, Robey Leibbrandt, recruited by the Nazis at the 1936 Berlin Olympics. Leibbrandt’s mission is to assassinate South African Prime Minister, General Jan Smuts. In 1941 Leibbrandt’s attempted coup is stopped by the actions of one man. Hundreds of Nazi supporters are detained all over the country. After the war some of the most prominent of these people formed the 1948 government that created Apartheid. Today’s South African Nazis fly the swastika, call their supporters to arms and openly salute Robey Leibbrandt. No copyright infringement intended.
It is based on the book 'The Fourth Reich' by Hans Strydom.
A similar book incidentally is 'The Land God made in Anger' by John Gordon Davis.
Also 'The Rise of the South African Reich' by Brian Bunting. The first season, second episode, of the South African TV series ‘Shoreline’ also has an insert about it.