Jacobus Gideon Nel Strauss, known as Koos Strauss, Kosie Strauss or J. G. N. Strauss, was a South African politician who was the leader of the South African United Party from 1950 to 1956.

Sir De Villiers Graaff, 2nd Baronet, known as Div Graaff, was a South African politician who succeeded his father, Sir David Pieter de Villiers Graaff, 1st Baronet, to his baronetcy in 1931. He died in 1999 and was succeeded by his son, Sir David de Villiers Graaff, 3rd Baronet. He was the leader of the centrist United Party which was the official opposition in the then all-white South African Parliament from 1956 to 1977.