black hat

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From the black stetsons (cowboy hats) traditionally worn by such villains.

black hat (plural black hats)

1. A villain in a story, especially in a Western (a film or other work of the Western genre).
2. (computing, computer security, slang) A malicious hacker, one who violates computer security out of malice or for personal gain.

• Black hat (computer security) on Wikipedia.Wikipedia

From the black hats traditionally worn by men in Haredi communities.

black hat (plural black hats)

1. A Haredi Jew; a member of an ultra-Orthodox Jewish community.

• Haredi on Wikipedia.Wikipedia