He was the founder and leader of the Bulgarian Social Democratic Party (BSDP) and the Bulgarian Communist Party (BCP). He was also a member of the National Assembly of Bulgaria and the Comintern.
Blagoev wrote extensively on philosophy, economics, history, and politics. Some of his most important works include:
- "The Social Question in Bulgaria" (1891)
- "The Historical Development of Bulgarian Society" (1896)
- "Marx and His Doctrine" (1901)
- "The Capitalist System and the Proletariat" (1904)
- "The Agrarian Question in Bulgaria" (1910)
- "The Russian Revolution and the Balkans" (1917)
- "The Communist International and the Bulgarian Workers' Movement" (1921)
Blagoev's writings have had a profound impact on Bulgarian political and intellectual life. He is considered one of the most important figures in Bulgarian history.