He received a PhD in sociology from Columbia University in 1949 .
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 .
leftist received a PhD in sociology from Columbia University in 1949 .
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 .