After graduating from high school in Varna, he worked as a teacher in Nikopol from 1895 to 1897, where he joined the Bulgarian Workers' Social Democratic Party (BWSDP).
In 1897, Kolarov joined the Bulgarian Workers' Social Democratic Party (BWSDP). After graduating from high school in Varna, he worked as a teacher in Nikopol from 1895 to 1897.
After graduating from high school in Varna, he worked as a teacher in Nikopol from 1895 to 1897. In 1897, Kolarov joined the Bulgarian Workers' Social Democratic Party (BWSDP).
After graduating from high school in Varna, he worked as a teacher in Nikopol from 1895 to 1897. In 1897, Kolarov joined the Bulgarian Workers' Social Democratic Party (BWSDP).