DIED. Alexander Dubcek, 70, reformist leader of Czechoslovakia whose attempt to introduce "socialism with a human face" during the Prague Spring of 1968 was crushed by Warsaw Pact tanks; of injuries suffered in an auto accident in September; in Prague. Though Dubcek's goal in instituting reforms was to strengthen socialism, the Kremlin feared erosion of party power. After the crackdown, Dubcek was stripped of his party membership. He re-emerged in November 1989 to join Vaclav Havel in proclaiming a democratic Czechoslovakia.