The Socialist Party was founded in 1918 as the political arm of the
syndicalist trade union National Workers' Secretariat (Nationaal Arbeiders' Secretariaat). All its founders had their personal background in the free socialist movement of
Ferdinand Domela Nieuwenhuis. The secretary of the NAS,
Harm Kolthek, became the
top candidate of the SP. In the
1918 election the threshold for admission to the
House of Representatives was relatively low, at just over half of 1% of the vote. Consequently, the SP was elected with only 9,000 votes (that is 0.7% of vote). In parliament, the party worked together with
League of Christian Socialists and the
Social Democrat Party (later Communist Party Holland) in the revolutionary parliamentary party. This cooperation was not very productive and soon Kolthek became more independent. In
1922, after the election laws were made more stringent, the SP was unable to retain its seats. Increased competition from the Communist Party Holland and the anarchist
Rapaille Party also inhibited electoral success. Meanwhile the power of the CPH over the NAS began to grow. In 1928 the party was officially dissolved. The party also competed in unsuccessfully in the
1925 elections. In 1929 most of its former members joined the
Revolutionary Socialist Party of
Henk Sneevliet. ==Ideology & Issues==