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In page Protests of 1968:

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In 1968, Czechoslovakia underwent a process known as the Prague Spring. In the August 1968 Soviet invasion of Czechoslovakia, Czechoslovakian citizens responded to the attack on their sovereignty with passive resistance. Soviet troops were frustrated as street signs were painted over, their water supplies mysteriously shut off, and buildings decorated with flowers, flags, and slogans like, "An elephant cannot swallow a hedgehog." Passers-by painted swastikas on the sides of Soviet tanks. Road signs in the country-side were over-painted to read, in Russian script, "Москва" (Moscow), as hints for the Soviet troops to leave the country.