At the Armenian Revolutionary Federation's 9th General Congress, which convened in Yerevan from 27 September, to the end of October 1919, the issue of retribution against those personally responsible for organizing the Genocide was on the agenda. A task force, led by Shahan Natalie, working with Grigor Merjanov, was established to assassinate Talaat Pasha, Javanshir Khan, Said Halim Pasha, Behaeddin Shakir Bey, Jemal Azmi, Cemal Pasha, Enver Pasha, as well as several Armenian collaborationists, in a secret operation codenamed Operation Nemesis.