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.