Shatorov graduated from the local Bulgarian Exarchate's junior school in Prilep and afterwards from the Bulgarian men's high school in Bitola. He also attended a pedagogic school in Skopje in 1914-1915. In 1918 the Bulgarian Army withdrew from Vardar Macedonia and Serbia annexed the area. He immediately emigrated to Bulgaria, where he became a member of the BCP in 1920. Furthermore, Sharlo was arrested for his participation in the September Uprising in 1923. In 1925 he became also a member of the IMRO (United) - de facto a BCP creation. As a significant party worker, he grew as a functionary of the Comintern and a member of the BCP Central Committee. He was imprisoned several times and emigrated to the Soviet Union for political reasons. During the Spanish Civil War Sharlo went to Paris as a coordinator of BCP. During World War II the Comintern sent him back to Vardar Macedonia (being then part of the Kingdom of Yugoslavia under the name 'Vardarska Banovina') to serve as a Secretary of the Macedonian Regional Committee of the Yugoslav Communist Party (YCP) since 1940. After the Bulgarian takeover of Vardarska Banovina in April 1941, the Vardar Macedonian communists fell in the sphere of influence of the BCP under Sharlo's leadership. The Macedonian Regional Committee refused to remain in contact with the YCP and linked up with BCP as soon as the invasion of Yugoslavia started. Sharlo refused to distribute the proclamation of the YCP which called for military action against the Bulgarians. He also became prominent with his anti-Serbian political views. The local committee of the YCP claimed that the Bulgarian army liberated the local population from the oppressive and despised Serbian bondage. Shatorov, a dedicated anti-fascist, was credited with the slogan "One people, one country, one party", by which he approved the Bulgarian invasion. For him not the Bulgarians, but the Serbs were the occupiers of Vardar Macedonia.