By 1963, a group of parties based around the large and open US Trotskyist Socialist Workers Party were moving back towards unity with the Fourth International, due to the disappearance of the Pabloite Socialist Union of America and sharing close positions on the 1956 Hungarian uprising and the Cuban revolution. However the SWP were hostile towards Raptis and his tactic of deep entryism and regarded him as a barrier to that unification. A world congress in 1963 formed the reunified Fourth International. Although Raptis was elected to the international executive committee, tensions grew and Raptis and his supporters were outside the International by the end of 1965 although its disputed as to whether this was because they were expelled or had split voluntarily.