It took part in the raids on prisons and counterintelligence of General Denikin, seized weapons and transported them to the Transnistrian partisans, and organized sabotage of the railways.

In 1922, Zayder learned that a cavalry corps was stationed in Uman, commanded by his debtor Kotovsky, and went to him with a request for help.

Kotovsky helped Zayder, arranging that the head of the guard Peregonovsky sugar plant, located near Uman.

Zayder, according to eyewitnesses, was very grateful to Kotovsky for the help, since finding work in the early 1920s was very difficult, and there were about 1.5 million people on labor exchanges (as of 1925).

[1] On the evening of 5 August 1925, Kotovsky was invited to a "bonfire" at a pioneer camp near Chebanki Luzanovsky, after which he returned home.

Approximately at 23:00 on the occasion of Kotovsky's departure, the red commanders who lived in the neighbourhood decided to give him a solemn farewell.

Soon after my father was brought to the veranda, and my mother was left alone by the body, Zayder ran in and fell to her knees before her, began to beat in hysterics: "I killed the commander!"

[1] In the fall of 1930, the 3rd Bessarabian Cavalry Division, stationed in Berdychiv, celebrated the tenth anniversary of its military path.

On the occasion of the jubilee, a holiday and manoeuvres were to be held, and veterans of the division were invited, including the widow of Grigory Kotovsky, Olga Petrovna, who had once served as a doctor in his brigade.

It is likely that, after strangling him, the murderers threw Zayder on the rails in the hope of imitating the accident, but the train was late, and their plan failed.

According to the memoirs of Grigory Grigoryevich Kotovsky's son, the chief organizer of the murder of Zayder was Odessit Valdman.

The role of Meyer Zayder (in the series he appears under the name Izya Majorchik) was performed by Alexey Filimonov.