The 1963 March on Washington Changed America. Its Roots Were in Harlem.
Sixty years ago, in the summer of 1963, a four-story town house on West 130th Street in New York City's Harlem neighborhood became the headquarters for what was then the largest civil rights event in American history, the March on Washington for Jobs and Freedom. For one summer, the house, a former home for "delinquent colored girls," was a hive of activity -- so frenetic that the receptionist twice hung up on Martin Luther King Jr. by mistake.
John Leland, New York Times