Its chairman was the journalist Hüseyin Hilmi, founder on 26 February 1919 of the socialist weekly İştirak.[4] Other leading members were Namık Hasan, Pertev, Tevfik, İbnil Tahir, İsmail Faik, Baha Tevfik, Hamid Suphi. After the fall of the Young Turks regime, the party was reactivated in 1919 under the leadership of Hüseyin Hilmi and Mustafa Fazıl under the name Socialist Party of Turkey (Turkish: Türkiye Sosyalist Fırkası, TSF). The party had contact from the beginning with the Second International, it was also represented at its congresses in Bern, Amsterdam and Geneva.