In 1925 Ivan Mihailov became the new leader of the IMRO.
In this period the organization took actions against the former left-wing activists, assassinating several of them.
Mihailov assigned Chernozemski to assassinate MP Dimo Hadzhidimov, a member of the Communist Party of Bulgaria and former IMRO member.
Chernozemski was arrested and sentenced to death by hanging for Hadzhidimov's assassination, but his execution was never carried out.
In 1925, Chernozemski escaped from a police escort.

In 1927, Chernozemski proposed to the IMRO Central Committee to enter the main conference building of the League of Nations in Paris and detonate grenades attached to his person, in order to attract the attention of the world and generate publicity over the question of the Bulgarians in Macedonia, but his proposal was rejected.
In 1929, the leadership of the IMRO called on Ante Pavelić and the Ustaše for cooperation.

In 1930, Chernozemski, following an order by Mihailov, assassinated another member of the IMRO, Naum Tomalevski, and his bodyguard.
Tomalevski had been a prominent member of the IMRO.
For the second time, Chernozemski was sentenced to death, but he was pardoned in 1932.
In 1925 Ivan Mihailov became the new leader of the IMRO. In this period the organization took actions against the former left-wing activists, assassinating several of them. Mihailov assigned Chernozemski to assassinate MP Dimo Hadzhidimov, a member of the Communist Party of Bulgaria and former IMRO member. Chernozemski was arrested and sentenced to death by hanging for Hadzhidimov's assassination, but his execution was never carried out. In 1925, Chernozemski escaped from a police escort.
In 1927, Chernozemski proposed to the IMRO Central Committee to enter the main conference building of the League of Nations in Paris and detonate grenades attached to his person, in order to attract the attention of the world and generate publicity over the question of the Bulgarians in Macedonia, but his proposal was rejected. In 1929, the leadership of the IMRO called on Ante Pavelić and the Ustaše for cooperation.
In 1930, Chernozemski, following an order by Mihailov, assassinated another member of the IMRO, Naum Tomalevski, and his bodyguard. Tomalevski had been a prominent member of the IMRO. For the second time, Chernozemski was sentenced to death, but he was pardoned in 1932.
Vlado Chernozemski