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Alexander Dubcek, left, Chairman of the Czechoslovakian Federal assembly, and Ludvik Svoboda are pictured during a commemoration assembly at former Nazi concentration camp "Theresienstadt" now Terezin, Chechoslovakia, now a national memorial graveyard, May 18, 1969. Later Dubcek delivered the main adress to some 500,000 protestors. (AP Photo/Broglio)