Which historical event does the betrayal by frederick represent?

In Animal Farm, Frederick betrays the pigs by accepting a deal from them and then paying them with fake money. This event is an allegory for a different type of betrayal, which occurred between Germany and the Soviet Union. While Germany and the Soviet Union were meant to be enemies prior to WWII (as Nazism and Communism are not compatible), they nonetheless signed a non-aggression pact in August, 1939. However, Hitler violated the terms and attacked the Soviet Union anyway in 1941.

i think the answer is invented words, rhyming knack, alliteration, and, metaphor.