He was a participant in conferences of the South society in Kiev and Kamenka, and negotiated with secret Polish society.
Mikhail Gorbachev | Mikhail Baryshnikov | Mikhail Bulgakov | Mikhail Lermontov | Mikhail Vrubel | Mikhail Bakunin | Mikhail Botvinnik | Mikhail Skobelev | Mikhail Semyonovich Vorontsov | Mikhail Glinka | Mikhail Chigorin | Mikhail Tal | Mikhail Arkadyevich Svetlov | Mikhail Turovsky | Mikhail Trepashkin | Mikhail Sholokhov | Mikhail Khodorkovsky | Mikhail Kaneev | Mikhail Boyarsky | Mikhail Bakhtin | Mikhail Vorontsov | Mikhail Tukhachevsky | Mikhail Pletnev | Mikhail Nesterov | Mikhail Natarevich | Mikhail Kasyanov's Cabinet | Mikhail Tomsky | Mikhail Saltykov-Shchedrin | Mikhail Olegovich Yefremov | Mikhail Mikhaylovich Gerasimov |
In late 1952, Ryumin reported to Minister of State Security Viktor Semyonovich Abakumov that Professor Yakov Gilyarievich Etinger had committed malpractice in treating Andrei Zhdanov and Shcherbakov, allegedly with the intention of killing them.