Mirche Atsev, or Mirče Acev, nicknamed Orovchanets, was a Bulgarian revolutionary from Ottoman Macedonia, a leader of an Internal Macedonian-Adrianople Revolutionary Organization (IMARO) revolutionary band.
Ottoman Vardar Macedonia, the territory covered by today's Republic of Macedonia
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He was one of the members of one of the one left political parties in Ottoman Macedonia in 1909–1910 - People's Federative Party (Bulgarian Section) which had its headquarters in Solun.
After the Young Turk Revolution during the Second Constitutional Era Sandanski was also founder and leader of one of the left political parties in Ottoman Macedonia - Peoples' Federative Party (Bulgarian Section), which headquarter was in Solun.