In 1921 he was one of the authors of an exposé of the Kronstadt rebellion and its suppression by the Bolsheviks, "The Truth about Kronstadt". Minor also served as chairman of the Society for Assistance to Exiles and Political Prisoners in Russia. Among his close friends was Ilya Fondaminsky ('Bunakov'), a veteran SR who later converted from Judaism to Orthodox Christianity and was murdered in the Auschwitz concentration camp in 1942. He wrote his memoirs, "Eto Bylo Davno" ("It was Long Ago"), covering the pre-war period; they were published posthumously in 1933.