The Bellamy-movement emerged in the Netherlands in 1927, and in 1933 the International Bellamy Association (IVB) was founded in Rotterdam.
During this period, a section of the movement felt a need to involve the ideals of Bellamy in party politics.
On May 30, 1945, just a few weeks after the end of the occupation the NBP was founded by a group of six IVB leaders in Groningen.
IVB, which was reorganized after the war, did not actively support the idea of a political party.
In April 1947 Van den Muyzenberg and the majority of the NBP members left to join the Progressive Party for a World Government.