At the end of 1929, arrests of employees of the Academy of Sciences, mainly archivist historians, began. In Moscow at that time, active preparations were underway for future demonstration processes of "pests" ("Industrial Party" and others). The Leningrad Joint State Political Directorate began to create from the arrested scientists a "monarchist counter-revolutionary organization". In January 1930, Sergey Platonov and all his closest employees were arrested in Leningrad, as well as Yevgeny Tarle, whom the investigation had read to the Foreign Ministers first as the "Industrial Party", then as the "Labour Peasant Party", then as the "Platonov Government".