In the 1960s, he joined the human rights movement in the Soviet Union, signed a number of collective letters, and participated in collecting materials for Alexander Solzhenitsyn's The Gulag Archipelago, being himself one of the 255 witnesses consulted by the author.
In 1969, he was re-arrested, declared insane and sent for compulsory treatment in the Orel special psychiatric hospital.
In 1978, a member of the Royal College of Psychiatrists Dr. Gerard Low-Beer visited Moscow and examined nine Soviet political dissidents, including Gershuni, and came to the conclusion that they have no signs of mental illness, which would require mandatory treatment currently or in the past.
[2] In the 1970s, Gershuni resumed his dissident activities as co-editor of the samizdat magazine Poiski (Quest or Investigations, 1976–1978), and was one of the founders in 1979 of "SMOT", the Free Interprofessional Association of Workers.
This time he was charged with publishing a SMOT newsletter and placed in specialized psychiatric hospitals, first Blagoveshchensk in the Soviet Far East, then Talgar in the Almaty Region of Kazakhstan.