Dr. Imre Kovacs, center, pastor of the First Magyar Reformed Church, addresses a group of some 200 Hungarian sympathizers outside the Soviet Union's United Nations embassy, 68th Street and Park Avenue, on May 4, 1957. The group picketed for two hours without incident, in contrast to their demonstration on April 27, which resulted in the arrest of two picketers. Some of the May 4 pickets carried black flags and black cloth-draped Hungarian flags in mourning for Hungarians killed in November, when a revolt in Hungary was suppressed by the Russians.