Harrington had spent the past two years lecturing at colleges and universities across the country, helping to build YPSL into a national organization boasting 1,000 members and a YPSL coalition project, the Student Peace Union, into a 10,000-member organization.
But to Hayden, Al Haber, Richard Flacks, and other SDS leaders, YPSL was not a model of anything to emulate; meanwhile, Harrington could not resist lecturing them about things they didn't understand, owing to their deficient backgrounds in Left politics.
In 1962, fifty-nine SDS delegates met at the United Automobile Workers camp in Port Huron, Michigan to draft a soon-famous manifesto, the Port Huron Statement, where they clashed with Harrington and YPSL leaders Richard Roman, Rochelle Horowitz, and Tom Kahn.
The Greater New York area was the center of YPSL
strength as several thousand radical youth galvanized the Socialist Party, pushing the entrenched, often foreign-born leadership, dubbed 'the Old Guard,' back into the fray.