At the beginning of 1964, Reverend Milton Galamison and other Harlem community leaders invited Rustin to coordinate a citywide boycott of public schools to protest their de facto segregation. Prior to the boycott, the organizers asked the United Federation of Teachers Executive Board to join the boycott or ask teachers to join the picket lines. The union declined, promising only to protect from reprisals any teachers who participated. More than 400,000 New Yorkers participated in a one-day February 3, 1964 boycott. Historian Daniel Perlstein notes that "newspapers were astounded both by the numbers of black and Puerto Rican parents and children who boycotted and by the complete absence of violence or disorder from the protesters." It was, Rustin stated, and newspapers reported, "the largest civil rights demonstration" in American history. Rustin said that "the movement to integrate the schools will create far-reaching benefits" for teachers as well as students.