political opponents, the military and NKVD were charged with various crimes and either imprisoned or executed
motives:
elimination of political opponents
paranoia
removal of experienced or skilled people
kamenev and zinoviev were put Montreal in Moscow in 1936
read out confessions and pleaded guilty in court
14 others were executed for their 'crimes'
Stalin believed russia had to be unified with him as leader to be strong
he became increasingly paranoid and power-mad
believed russia had 10 years to catch up with the western world before germany invaded
can be seen as part of an aggressive programme to create a dictatorship
party members who failed to implement collectivisation well enough or who disagreed with Stalins attempt to liquidate the kulaks as a class lost their party card, reducing the total membership by about a tenth
during the mid 1930s the party shed a further third of its members who were seen to be resisting the pace of industrialisation and collectivisation
form the mid 1930s some prominent politburo members were exiled or executed after being called oppositionists
the event which tirggered the Great Purges was the murder of Kirov in 1934