The SLL was part of the International Committee of the Fourth International (ICFI).
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Hamilton was for many years closely linked with Gerry Healy but, in 1971, she sided with Pierre Lambert and the French OCI Internationalist Communist Organisation when the ICFI split into two, ostensibly over the place of philosophy in Marxist theory, but equally about control of the ICFI after the OCI grew to be larger than the SLL in the late 1960s.
Betty Hamilton, an SLL founder and a Trotskyist since the 1930s, had sided with Lambert in 1971 but remained isolated, although still formally an SLL member until 1974.
Hamilton | Hamilton, Ontario | Hamilton, New Zealand | Hamilton Tiger-Cats | Alexander Hamilton | Ugly Betty | Hamilton College | Betty Grable | Betty Boop | Hamilton College (New York) | Betty White | Betty Foss | Hamilton County, Ohio | Hamilton, Bermuda | Josh Hamilton | Booz Allen Hamilton | Betty Hutton | Hamilton, New York | Lewis Hamilton | Lee H. Hamilton | Hamilton County | Scott Hamilton | William Rowan Hamilton | Peter F. Hamilton | Linda Hamilton | Betty Friedan | George Hamilton | Betty Shabazz | Betty Buckley | Atomic Betty |