Photograph. "697-88-9 -- watch credit... International News Photos, slug (Union) -- Union Square turns black with 'reds' -- on May Day -- New York -- Spacious Union Square looks like a behive as swarms of communists take possession of it for their annual May Day demonstration. They crried brilliant red banners and sang sporadic snatches of the 'Internationale' before being addressed by their leaders. Some 20,000 of them had marched from the Battery. A record number of police were assigned to preserve order. The socialists held a mass meeting of their own in Madison Square a scant half-mile away. (E-5-1-34)-3-30" -- typed note attached to verso.