 The origins of the group derive from a 1964 group of activists within the American Socialist Workers Party who were expelled for refusing to support the leadership of the Cuban Revolution.The American group sent some of its members to the UK in 1975, to form the London Spartacist Group.In 1977 the group was joined by New Zealanders Bill Logan and Adaire Hannah, who had led the Spartacist League of Australia and New Zealand from 1972 to 1977, and who were "transferred to London at the behest of the Spartacist international leadership" with a view to strengthening the tendency's organisation there.