His name was restored only in the mid-1980 's , when Mikhail Gorbachev , citing Khrushchev as a mentor , began the liberal changes that ultimately brought about the collapse of the Soviet Union in 1991 .
Mikhail Gorbachev /people/person/nationality Soviet Union
PRP$ NN VBD VBN RB IN DT NN POS , WRB NNP NNP , VBG NNP IN DT NN , VBD DT JJ NNS WDT RB VBD IN DT NN IN DT NNP NNP IN CD .
Mikhail Gorbachev
PERSON
Soviet Union
LOCATION
/people/person/nationality