The ISL moved away from revolutionary politics and merged with Norman Thomas' Socialist Party in 1958.
Landy was a prominent supporter of Hal Draper's left opposition to Shachtman's support for the Bay of Pigs invasion, joined Draper in splitting from the Socialist Party in the early 1960s.
In 1969, it became the International Socialists (IS), and Landy retained a leadership role, but he became increasingly interested in the ideas of black power and the ideals of the French uprising of May 1968.
[1] Although he was elected to the Central Committee of the new organisation, in 1975 he opened a debate over what he believed was an increasing stagist tendency, and the organisation's refusal to call for a global general strike under then current circumstances.
[4] Sy Landy remained the National Secretary of the LRP until his death, occasionally working as a teacher in Jersey City.