The two propaganda techniques that this sentence best represents are:
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Ad hominem attack - The statement attacks the opponent's character by labeling them a "monster" rather than addressing policies or arguments.
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Dehumanizing the enemy - Referring to the opponent as a "monster" dehumanizes them, making it easier to portray them as untrustworthy and dangerous.
So the correct answers are: ad hominem attack and dehumanizing the enemy.