A stereotypical pirate is featured. This typically involves the flying of skull and crossbones flags, the wearing of eye patches, plundering, and lots of "hardy har har" talk.

Examples:
Orion space pirates hijacked a Federation cargo freighter in tas2x01 "The Pirates of Orion". Contrary to popular belief they did not appear to wield space cutlasses.

References:
https://en.wikipedia.org/wiki/Pirates_in_popular_culture