Which of the following was a major event that demonstrated the lengths to which stalin would go to address people he felt threatened his power
a) long march
b)great purge
c) soviet revolution
d) siberian prison

The correct option is "b)great purge"

The great purge was the name given to the series of campaigns of repression and political persecution carried out in the Soviet Union in the late 1930s. Hundreds of thousands of members of the Soviet Communist Party, socialists, anarchists and opponents were persecuted or watched by the police; In addition, public trials were held, hundreds of thousands were sent to Gulag concentration camps and others were executed.

The campaign of repression unleashed in the Soviet Union was crucial to consolidate Iosif Stalin's power. Although the Soviets later justified this bloody measure, arguing that the path of "saboteurs" or dissidents for the future war with Nazi Germany was cleared, a large number of the victims were members of the Communist Party and leaders of the Armed Forces.