Who was an adivisor to the eighth leader of the Soviet Union who died in 2006? 
Vadim Zagladin: Vadim Valentinovich Zagladin (June 23, 1927 - November 17, 2006), Soviet politician and ideologist, was one of the leading theoreticians of Perestroika. Mikhail Gorbachev:  He was the eighth and last leader of the Soviet Union, having been General Secretary of the Communist Party of the Soviet Union from 1985 until 1991.
Vadim Valentinovich Zagladin