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An army soldier and a police grenadier close upon 3 young demonstrators at the Zocalo or main square in Mexico City, as 10,000-strong anti-American demonstration was dissolved when it was about to burn a U.S. flag and an effigy of President Kennedy, April 21, 1961. About 150 were reported arrested after the scuffle was over. (AP Photo/SFD) (KEYSTONE/?/SFD)