Datiko Tsikhelashvili;[1] Dzambo Dzambidze;[1] Aslan Rashidovich Usoyan (Georgian: ასლან რაშიდოვიჩ უსოიანი, Russian: Асла́н Раши́дович Усоя́н; 27 February 1937 – 16 January 2013), also known as Baba Gurgur and Grandpa Hassan ("Дед Хасан") or just Grandpa ("Дедушка"), was a Georgian-born Soviet-Russian mobster of Yazidi Kurdish descent,[2] who began his career operating in Georgia, continued in Moscow, Ural, Siberia, Uzbekistan, Krasnodar, Sochi, and other parts of the former Soviet Union.

[7] Usoyan also retained significant influence in the Ural, but a brutal war broke out there between various criminal groups, including those who supported the Hasan clan.

In August 1992, at a meeting of representatives of the criminal world, which took place in the Yekaterinburg, the Slavic 'thieves in law' Viktor Sidorenko and Bozhenka condemned Hasan's actions, which led to a wave of violence.

[1][8] Starting in 2007, Usoyan was embroiled in a gang war with Georgian mobster Tariel Oniani, who was seeking to reestablish himself in Moscow.

Several of Usoyan's top lieutenants were killed including the Armenian national Alek Minalyan, a man allegedly in charge of extorting construction firms working on the 2014 Winter Olympics.

[12] On 16 September 2010, Usoyan was shot by a 9 mm calibre bullet fired by an unidentified assailant in central Moscow, but survived the attack along with his bodyguard who was also wounded.

[15][16] On 16 January 2013 and a month before his 76th birthday, Usoyan was shot in the head by a sniper perched on the sixth floor of an adjacent apartment building after leaving a restaurant which served as his office, and despite efforts of his bodyguards and ambulance workers he died en route to the hospital.

The day Usoyan was shot dead, an Armenian crime fiction writer, Sergey Galoyan, said in a conversation with a local news website that the mafia king's murder might be linked to a certain unrest in the criminal world, particularly the construction of the Sochi Olympic facilities which are said to have attracted considerable investments.