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After the 1917 October Revolution, the party formed an anti-Soviet bloc along with the Georgian Mensheviks, the Armenian Revolutionary Federation ("Dashnaks") and the Azeri Musavat Party.
After Armenia lost its independence to the Bolsheviks, Yerganian went to Tbilisi where he and Misak Grigorian were assigned to assassinate former Prime Minister of the Democratic Republic of Azerbaijan Fatali Khan Khoyski and leader of the Musavat party Khan Mahmadov.