SWP was founded in 1959, after a split within the leadership of the Communist Party of the Netherlands.
[2] They had formed the Brug-group, and launched the new party in July 1959.
[3] The party held its first congress in Amsterdam, January 23–24, 1960.
[4] Ideologically SWP adhered to Marxism-Leninism, and the party was organized along the lines of democratic centralism.
[2] In 1965 the majority of SWP members joined the Pacifist Socialist Party.