Answer:
The false confessions extracted from the four pigs.
The slaughter of the pigs by the dogs at Napoleon's order.
Explanation:
The Great Purge was an event in the history of the Russian government during 1936-38. During this period, the Russian dictator Joseph Stalin ordered those 'traitors' of his government to be on trial and even killed. The period was strife with ethnic cleansing, 'removing' dissenting people, murders, trials known and unknown, etc.
Similar to Stalin's rule, Napoleon also carried out trials and killings as he deems fit. He would order his dogs to 'execute' his order, which can be seen in the given excerpt when the four pigs were killed by the dogs. Not only that, extracting false 'declarations/confessions' from the pigs which is the cause of their 'execution' was also a similar element to that of Stalin's "Great Purge".
Thus, the correct answers are the second and fourth options.
