He then moved to Tiraspol and began to carry out subversive activities in Romania, using many of his contacts in the exiled Makhnovist movement. Zadov worked with the Foreign Centre to organise safe passage for any Makhnovists who wished to return from exile and receive amnesty from the Ukrainian Soviet government. He increasingly networked with other amnestied Makhnovists and reportedly established a Makhnovist cell in Odesa, with plans to establish insurgent detachments in the wider region. But following Makhno's death in 1934, the network began to fall apart and an inquiry was initiated by the NKVD. In August 1937, the Odesa Makhnovists were exposed as part of the Great Purge, revealing 90 active dissidents within the organisation.
