Nazi

The term Nazi is an abbreviation of the designation Nationalsozialist, used originally only for members and supporters of the Nationalsozialistische Deutsche Arbeiterpartei (abbreviation: NSDAP; English: National Socialist German Workers' Party). The Nazi Party was a fascist party within the Earth nation of Germany during the 20th century which eventually took control of the German government and formed a Nazi state, which was often referred to as the Third Reich.

Background
The Nazi party became a tool for governmental domination by power-mad dictator Adolf Hitler. The Nazis of Germany, part of the Axis Powers gained power in Germany in the 1930s and 1940s. In the late 1930s and early 1940s they began a conquest of Europe, and were the principal participants in the Second World War. The Nazis set a standard for dictatorship, hatred, and fascism that has rarely been matched in their thirst for conquest, and their oppression, brutality and intolerance towards their fellow human beings. This was evidenced by Nazi persecution and systematic extermination of elements they deemed inferior in their own society - such as those of the Jewish faith.

The United States, Great Britain, and the Soviet Union formed an alliance to fight the Nazis, and in a destructive conflict managed to drive the Nazis first back to Germany, then defeated them. The defeat of the Nazis came at a cost of millions of lives, and widespread destruction. (TOS episode Patterns of Force).

Ekos and Zeon
The Nazi party was abolished after their defeat. Even so various groups who held Nazi ideals would still rise up from insular populations on Earth over the years. One such group was started on the planet Ekos by the historian John Gill as a twisted social experiment.

Gill was a cultural observer sent undercover and alone to Ekos to monitor Ekosian society. At the time, the planet was in anarchy. Gill violated the Prime Directive by attempting to institute a more benign version of the Nazi government on that planet. In the process, Gill showed just how dangerous the Nazi message could be, centuries after the death of Adolf Hitler and the original Nazi party.

Using the Nazi party as a model, Gill hoped to restore order on the planet. However his subordinate Melakon soon seized power by drugging Gill and manipulated the populace into the same brutal racial supremist policies of the original party. The main target in this case was the people of their planetary neighbor Zeon. Zeons were expelled from the Ekosian planet, or worse, rounded up into camps, just as had been done to the Jews on Earth. Gill was now a puppet, drugged and helpless as the worst excesses of the Nazi party came to light. A landing party from the Federation starship Enterprise attempted to rectify the damage to the society of Ekos before they could launch of an attack against the Zeon homeworld. Gill was eventually killed by Melakon when he denounced the usurper, who in turn was killed himself. A resistance effort to co-opt power from the decapitated Nazis came to power afterwards.

As he died in the arms of former student James T. Kirk, Gill admitted that he made a terrible mistake, that the non-interference directive was the correct way of dealing with less advanced people. The incident would come to be regarded as a textbook example of the importance of the Prime Directive. (TOS episode Patterns of Force.

An Alternate History
In an alternate timeline created by the interference of the Na'kuhl faction of the Temporal Cold War, the Third Reich was able to conquer the eastern seaboard of the United States. In this timeline Washington and New York City were among the cities conquered by the Nazis - using technology given to them by the Na'kuhl. Adolf Hitler later visited Nazi occupied New York in 1944.

The temporal agent Daniels brought the Enterprise (NX-01) back to the 20th century. Jonathan Archer and his crew were able to destroy a temporal conduit that the Na'kuhl were using - which reset the timeline back to normal. (ENT episodes Zero Hour and Storm Front).

The Hirogen
In 2374, the Hirogen captured the USS Voyager (NCC-74656) while it was in the Delta Quadrant. They then used holodeck simulations in an attempt to better understand the their prey. One of the simulations was set during the World War II years in Nazi occupied France, with Janeway, Tuvok, and Neelix participating being forced to pose as members of a French resistance group.