Note that Hitler used ganglike thugs to GET into power, even though he eliminated them once he got there. Much like the Kennedys using the mafia, then needing to dispose of them (at which they were not quite as successful as Hitler) afterward to keep power.
Think Antifa, BLM, hordes of non-Americans who could be brought against us lowly taxpayers due to their holy illegal status, who did come from violent lands... it’s not like they aren’t rallying right now today everywhere in this land or anything, so there is no way they could be brought to terrorize innocent towns....
The premise of the alternate history movie “Fatherland”, was that the Nazis were eliminating everybody with direct knowledge of The Holocaust.