Leonid Plyushch, Ukrainian mathematician and Soviet dissident. In 1968 he protested against the misconduct of the Galanskov–Ginzburg trial by sending a letter to Komsomolskaya Pravda, which was not published. When Soviet troops invaded Czechoslovakia in 1968, Plyushch jointly signed with 16 other Soviet dissident a declaration of solidarity with the democratic movement in Czechoslovakia. In the same year he joined the Initiative Group for the Defense of Human Rights in the USSR, which sent a letter to the UN Human Rights Commission asking it to investigate the violations by the USSR of the right to hold independent beliefs and to propagate them by legal means. Plyushch was one of the fifteen signatories to this letter. Due to blowback from his political stances, he was dismissed from the Cybernetics Institute in 1968, and the KGB confiscated a number of his manuscripts and interrogated him several times. e was arrested in January 1972 on charges of anti-Soviet activity, and was jailed for a year before his trial began. During his trial, the court sat in camera and in the absence of the accused. Although no expert witnesses of any kind were called, Plyushch was declared insane, and was ordered to be "sent for treatment in a special type of hospital." He was locked up in a ward for severely psychotic patients in the Dnipropetrovsk Special Psychiatric Hospital where was administered high doses of haloperidol, insulin and other drugs, which temporarily made him incapable of reading and writing.Three commissions that examined him after a year of detention, one of which was chaired by Andrei Snezhnevsky, found him suffering from "reformist delusions" with "Messianic elements" and "sluggish schizophrenia."