The "Great Betrayal" in Ceylon, the formation of the American Committee for the Fourth International, and the founding of the Workers League
In June 1964, amid a massive crisis pregnant with revolutionary possibilities, the Pabloite LSSP entered into Madame Bandaranaike’s Sri Lanka Freedom Party government. This was the first time that a party claiming to be Trotskyist and historically associated with the Fourth International had entered into a bourgeois government.
Source: wsws.org