Lee Harvey Oswald, the assassin of President Kennedy in 1963, had defected to the Soviet Union several years earlier, but returned to the U.S. after becoming disillusioned with that country. He is shown here in a Dallas police station after his arrest for Kennedy's shooting. AP hide caption

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Father Mina celebrates the Christmas Nativity Liturgy, the start of Christmas, at the Coptic Orthodox Church of St. George on Jan. 6 in Brooklyn, N.Y. Coptic churches around the country have witnessed a surge of Christians fleeing Egypt since the start of the Arab Spring. Spencer Platt/Getty Images hide caption

itoggle caption Spencer Platt/Getty Images