He killed two notable Bulgarian politicians, communist Dimo Hadzhidimov, and IMRO member Naum Tomalevski.

[6][7] Velichko Dimitrov Kerin was born in the village of Kamenitsa, then in the Principality of Bulgaria, now a quarter of the town of Velingrad.

His mother died when he was 14 years old and the young Kerin was induced to help his father feed the family along with his younger brother and two sisters.

According to a conspiracy theory promoted by himself,[11] he was born in a village called Patrick near Štip, that was burned down by the Serbian army during the Second Balkan War, and was never restored.

In the early 1920s, he moved to Bansko, when the Internal Macedonian Revolutionary Organization (IMRO) was re-established by Todor Alexandrov.

Chernozemski also entered the region of Vardar Macedonia with IMRO bands and participated in more than 15 skirmishes with Yugoslav police.

[19] Chernozemski was arrested and sentenced to death by hanging for Hadzhidimov's assassination, but his execution was never carried out.

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.

A police officer fired at Chernozemski but missed and fatally wounded Alexander's companion French Foreign Minister Louis Barthou.

[24] After shooting a policeman who tried to seize him and inadvertently killing two bystanders, Chernozemski then futilely attempted to flee the scene but was struck by a slash from an escorting cavalryman's sabre, stunning him.

Since the assassin was in critical condition, he was unable to say anything and succumbed to his injuries later that evening, 10 days before his 37th birthday.

The French police were unable to identify him; they could only register the tattoo on his left arm containing skull with crossbones, a sign reading "В.M.Р.O."

In the night of October 10, the French police arrested in Paris the Ustaša terrorists Zvonimir Pospišil and Ivan Raić.

[27] In 1934, sections of the Macedonian Patriotic Organization, named after him, were founded in Windsor, Ontario, Canada,[28] and Shepparton, Victoria, Australia.

What was Vlado Chernozemski's nationality", the following is stated: Chernozemski remains a symbol of lasting friendship between the Croatian people and the Bulgarians, but in no case he is a symbol of any Macedonian nation, such as Chernozemski had never met anywhere in Macedonia, although he had been there for a long time as a guerrilla ... We need to point out that both, under the Ottoman regime and in the Great war against Serbia, as well as between the two world wars, not some imagined Macedonians, but only Bulgarians, fought against the Serbian rule in Macedonia.

[32] A memorial plate was erected in his honor in Velingrad in October 2005, with the financial support of VMRO-BND and a Macedonian Bulgarian association "Horizonti" (Horizons) from Ohrid, present day North Macedonia.