 Complete the following phrase:  Due to his chairmanship of the All-Union Central Council of Trade Unions, in 1990 he gained a seat in the 28th Politburo and Secretary of the Central Committee. Later that year, on 27 December, with the help of Mikhail Gorbachev, Yanayev was elected the first, and only, Vice President of the Soviet Union. Having growing doubts about where Gorbachevs reforms were leading, Yanayev started working with, and eventually formally leading, the Gang of Eight, the group which deposed Gorbachev during the 