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A brutal police action against peaceful march of students in Prague on November 17, 1989, sparked the Velvet Revolution, a series of non-violent protests and demonstrations that toppled the authoritarian Communist regime in Czechoslovakia. Workers arrive to Wenceslas Square to attend a mass demonstration during general strike on November 27, 1989. The banner reads "Workers Are Here!". CTK Photo/Pavel Hroch (KEYSTONE/CTK/Hroch Pavel)