The Socialist Equality Party (SEP) is an American Trotskyist political party. SEP first formed in 1964 as the American Committee for the Fourth International, created by expelled members of the Socialist Workers Party. SEP and its previous forms were associated with the International Committee of the Fourth International (ICFI), a Trotskyist political international. SEP describes itself as a revolutionary socialist party, because the SEP believes capitalism is "beyond reform" and only "a revolutionary movement that has as its aim the establishment of workers' power" can win socialism.
https://en.wikipedia.org/wiki/Socialist_Equality_Party_(United_States)