He graduated from City College of New York , where he was an anti-Stalinist leftist , and later became National Chairman of the Young People 's Socialist League .
Seymour was active in the Young People 's Socialist League , an organization of young Trotskyists .
Seymour graduated from City College of New York , where Seymour was an anti-Stalinist Seymour , and later became National Chairman of the organization         .
Seymour was active in the Young People 's Socialist League , an organization of young Trotskyists .