To bring this back to our political themed website, the Wikipedia description of the Daleks could easily describe the “American” Left.
To wit:
The Daleks are a powerful race bent on universal conquest and domination, utterly without pity, compassion or remorse. Various storylines portray them as having had every emotion removed except hate, leaving them with a desire to purge the Universe of all non-Dalek life. Collectively they are the greatest enemies of the series’ protagonist, the Time Lord known as the Doctor. They are popularly known for their catchphrase “Exterminate!”