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Soviet invasion of Czechoslovakia (1968 Red Square demonstration). ️<unk>️<unk>️<unk> None of the participants plead guilty, and they were subsequently sentenced to labor camps or of psychiatric imprisonment.<unk> None of the participants plead guilty, and they were subsequently sentenced to labor camps or of psychiatric imprisonment. Poet Natalya Gorbanevskaya collected testimonies on the demonstration as "Noon" (1968) before her incarceration in 1970.