Totalitarianism is a political system in which the state recognizes no limits to its authority and strives to regulate every aspect of public and private life wherever feasible. A distinctive feature of totalitarian governments is an "elaborate ideology, a set of ideas that gives meaning and direction to the whole society". 

Totalitarianism is the most severe and extreme form of authoritarianism. 

The concept was first developed in the 1920s by the Weimar German jurist, and later Nazi academic, Carl Schmitt, and Italian fascists. Schmitt used the term, "Totalstaat," in his influential work on the legal basis of an all-powerful state, "The Concept of the Political" (1927). The concept became prominent in Western political discourse as a concept that highlights similarities between Fascist states and the Soviet Union. 

The notion of totalitarianism as a "total" political power by the state was formulated in 1923 by Giovanni Amendola, who described Italian Fascism as a system fundamentally different from conventional dictatorships. The term was later assigned a positive meaning in the writings of Giovanni Gentile, Italy’s most prominent philosopher and leading theorist of fascism. He used the term “totalitario” to refer to the structure and goals of the new state, which were to provide the “total representation of the nation and total guidance of national goals.” He described totalitarianism as a society in which the ideology of the state had influence, if not power, over most of its citizens. According to Benito Mussolini, this system politicizes everything spiritual and human: "Everything within the state, nothing outside the state, nothing against the state."
What political force was he associated with?
 Nazi academic, Carl Schmitt, and Italian fascists