Yosef Mendelevitch issues in 1969. Being repeatably refused the right to immigration, he became one of the leaders of the Dymshits–Kuznetsov hijacking affair, recounted in his 2012 memoir, "Unbroken Spirit". As punishment, he was imprisoned for eleven years. During the imprisonment he was punished for keeping Jewish precepts. In 1981, after a worldwide struggle, he was released and immigrated to Israel. He served in Soviet prisons with famous Jewish dissident Natan Sharansky (amongst others). In Sharansky's memoir "Fear No Evil" he describes innovative ways Mendelevitch used to communicate with Sharansky, such as through both toilet bowls and radiators. Mendelevitch had always exhibited
Eli Sadan During his studies, he was asked by Rabbi Kook to assist in establishing Moshav Keshet in the Golan Heights and in establishing a core of Torah scholars in Eilat. Together with Rabbi Tzvi Tau, he was delegated by Rabbi Zvi Yehuda with regarding to prisoners of Zion, among them Natan Sharansky. They even held a secret telephone conversation before Sharansky entered the Russian prison. Afterwards, Sadan held several meetings with US officials in order to secure Sharansky's release. In 1988, Sadan established the first pre-military preparatory program (mechina), together with Rabbi Yigal Levinstein. The mechina is named "Bnei David" and