The Purified National Party was a break away from Hertzog's National Party

National Party

-Active parties:-Former parties:...

 which lasted from 1935 to 1948.

In 1935, the United Party

United Party (South Africa)

The United Party was South Africa's ruling political party between 1934 and 1948. It was formed by a merger of most of Prime Minister Barry Hertzog's National Party with the rival South African Party of Jan Smuts, plus the remnants of the Unionist Party...

 was formed out of the merger between Hertzog's National Party and the rival South African Party

South African Party

The South African Party was a political party that existed in the Union of South Africa from 1911 to 1934.-History:The outline and foundation for the party was realized after the election of a 'South African party' in the 1910 South African general election under the leadership of Louis Botha...

 of Jan Smuts

Jan Smuts

Jan Christiaan Smuts, OM, CH, ED, KC, FRS, PC was a prominent South African and British Commonwealth statesman, military leader and philosopher. In addition to holding various cabinet posts, he served as Prime Minister of the Union of South Africa from 1919 until 1924 and from 1939 until 1948...

. Daniel François Malan

Daniel François Malan

Daniel François Malan , more commonly known as D.F. Malan, was the Prime Minister of South Africa from 1948 to 1954. He is seen as a champion of Afrikaner nationalism. His National Party government came to power on the program of apartheid and began its comprehensive implementation.- Biography...

 strongly opposed the merger; he and 19 other MPs

Member of Parliament

A Member of Parliament is a representative of the voters to a :parliament. In many countries with bicameral parliaments, the term applies specifically to members of the lower house, as upper houses often have a different title, such as senate, and thus also have different titles for its members,...

 defected to form the 'Purified' National Party, which he led for the next fourteen years as opposition. Malan also opposed South African participation in World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, which was already unpopular among the Afrikaner

Afrikaner

Afrikaners are an ethnic group in Southern Africa descended from almost equal numbers of Dutch, French and German settlers whose native tongue is Afrikaans: a Germanic language which derives primarily from 17th century Dutch, and a variety of other languages.-Related ethno-linguistic groups:The...

population and led to a split in the governing party; this dramatically increased his popularity, and he consequently defeated Smuts and the United Party in 1948.