Answer: Napoleon removes Snowball for his own purposes just as Stalin removed those in his own party.
Step-by-step explanation:
Animal Farm by George Orwell is an allegory to the events in the Soviet Union after the death of Lenin led to a power struggle between Trotsky and Stalin.
Napoleon and Snowball in the book have different views on how to proceed after they had seized the farm just like Stalin and Trotsky did after the death of Lenin. This led to Napoleon deceitfully getting rid of Snowball just as Stalin got rid of Trotsky.