The aim of the graduate thesis is to explain dictatorships through history, such as Stalinism, Naziism and fascism, which each of them gave in their own way the seal of the 20th century. The work is divided into three themes. The first part will explain the political regime in the Soviet Union during the rule of Josif Visarionovich Stalin, so-called Salinity. In the second part of the paper, the political regime in Germany, Nazi nation or national-socialism will be described in more detail as a political ideology created by the German National Party NSDAP and its party program from 24 February 1933 to the military defeat of the German Army in 1945 Furthermore, the third part explains fascism as a form of radical authoritarian nationalism during the reign of Benitez Mussolini in Italy from October 1922 to the defeat of Italy in the Second World War in September 1943