Revolutionary Socialist Party (UK)
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The Edinburgh-based Revolutionary Socialist Party was a Trotskyist group. It developed out of the British Section of the International Socialist Labour Party, a socialist grouping formed around the teachings of Daniel DeLeon which split from the Socialist Labour Party during World War I. After rejecting several approaches from the SLP to rejoin, the small party moved towards Trotskyism as a result of their own study and became the RSP.
In 1937, the small party joined, through the process of regroupment, the Revolutionary Socialist League. However, they soon became dissatisfied with the RSL and disintegrated with the older members joining the Independent Labour Party while the younger members joined the Workers International League.