The best replacement for nazis is kkk.

The best alternatives to nazis are rated as following:
★★★★★  kkk
★★★★★  jews
★★★★★  communists
★★★★  soviets
★★★  vietcong
★★★  stormtroopers
★★★  skokie
★  allies
★  nazi's
  punks
  natzis
  confederates
  japanese worse
  judios
  russians
  communist

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Speaking about nazis, one probably shouldn't forget about anne frank.

Other search terms related to nazis and their ratings are:
★★★★★ anne frank
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