Ekosian SS

The Ekosian SS were a faction of hostile humanlike aliens and antagonists in Star Trek, under the command of the genocidal Melakon they became brutal and hateful agents of his will who took delight in torture and execution.

Unlike many other Ekosians they also happily took to outright genocide against the Zeon minority and were a dark parallel of the SS from Earth (who they likely idolized, much as Melakon idolized Hitler).

With the death of Melakon and the end of his genocidal campaign it is likely the current Ekosian SS was disbanded and punished for their crimes - however it is possible they still exist under a new name and function as the Ekosians did not entirely give up Nazism despite the horrors it had unleashed upon them.