Refusenik authorities to significantly increase the emigration quota. In the years 1960 through 1970, only about 3,000 Soviet Jews had (legally) emigrated from the USSR; after the trial, in the period from 1971 to 1980 347,100 people received a visa to leave the USSR, 245,951 of them were Jews. Refuseniks included Jews who desired to emigrate on religious grounds, Jews seeking to immigrate to Israel for Zionist aspirations, and relatively secular Jews desiring to escape continuous state-sponsored antisemitism. A leading proponent and spokesman for the refusenik rights during the mid-1970s was Natan Sharansky. Sharansky's involvement with the Moscow Helsinki Group helped
Natan Sharansky High treason carried the death penalty. The following year, in 1978, he was sentenced to 13 years of forced labor. Sharansky spent time in the Lefortovo Prison in Moscow, followed by Vladimir and Chistopol prisons, where for part of the time he was placed in solitary confinement. His health deteriorated, to the point of endangering his life. Later he was detained in Perm 35, a post-Stalin-Gulag-type so-called "strict regimen colony" in Perm Oblast. He kept himself sane during solitary confinement by playing chess with himself, in his head. Sharansky appeared in a March 1990 edition of "National Geographic" magazine. The