Joseph Stalin, who was of Georgian origin, belonged to haplogroup G2a1a. This was determined by testing his grandson, Alexander Burdonsky (his son Vasily’s son).
http://www.eupedia.com/europe/Haplogroup_G2a_Y-DNA.shtml
http://polsergmich.blogspot.com/2013/06/blog-post_21.html
http://mytashkent.uz/2016/10/07/uzbekskaya-tyubetejka-kak-chast-svetskogo-obraza-natsii/
http://tubetey.livejournal.com/
Distribution of haplogroup G in Europe, North Africa and the Middle East