The best example of Nazism and Fascism would probably be present in Europe in the 1930s. Fascism, complete authoritarian control with a noticeable lack of tolerance for dissent and institutional checks, could probably be best seen in a leader like Benito Mussolini. He demonstrated Fascism in his willingness to personify government and his unwillingness to surrender any of his political power to anyone or anything else. In a singular representation of political will, Mussolini would represent fascism. Nazism, or national socialism, would be best represented by Adolf Hitler and the Nazi party. Advocating a very extreme form of national socialism, this government represented a consolidation of power for Hitler and his Nazis. Both fascism and Nazism were on display in Europe during the 1930s and represented a time when singular notions of the political good were either being accepted by people or forcibly being imposed on those who attempted to voice discontent but without much success.
The government of Germany before and during World War II was an example of both Nazism and Fascism. This is because Nazism is really just a form of fascism.
Basically, fascism is an ideology that says that a country should be run on nationalist principles. That is, the country should honor its own ethnicity and look down on all others. It also says that all people should obey the leader of the country (it is authoritarian). Finally, fascists believe that all of society should sort of be one organic whole that is led by that one leader. Nazism held these beliefs, with the ruler, of course, being Hitler.
Nazism and Fascism are two closely resembling forms of government. There is no clear cut principles or philosophy underlying either of these two system of government. Rather their character is defined by nature of such government as it actually existed, Nazism in Germany from 1933 to 1944 under the leadership of Hitler, and Fascism in Italy from 1922 to 1943 under the leadership of Mussolini. Neither of these two forms of governments have existed in any other country at any other time, although many dictatorial government do display many of the characteristics of these type of government.
Both Nazism and Fascism are characterized by a strong government with dictatorial power, which has the authority to intervene in any and every aspect of personal lives of people in the name of achieving common good of the nation as a whole. Unlike communism, individual are allowed to own, control and use meas of production and other properties. But the government is free to exercise any control over it is it considers fit in the interest of the country.
Also individual freedom and right are considered secondary to the common interests, and under the pretext of this common interest, private liberty, property and life may be taken away any time without any opportunity of legal defence. It was this principal of common good superseding the individual life and freedom that was used by Hitler to persecute the Jews.