The first of the pieces of legislation that would collectively form Apartheid to be created by the National Party after they took power in 1948. It was a self-evidently a pointless piece of law in its own right – only 0.23% of all marriages in South Africa from 1946-1948 were mixed – but it was the thin end of the Apartheid wedge, the beginning of that oh so slippery slope.
The law was repealed in 1995, after the fall of the Apartheid regime.