Gramsci wrote more than 30 notebooks of history and analysis during his imprisonment. These writings, known as the Prison Notebooks, contain Gramsci's tracing of Italian history and nationalism, as well as some ideas in critical theory and educational theory associated with his name. With cultural hegemony Gramsci developed an idea from Marxism into an acute analysis to explain why the "inevitable" revolution of the proletariat predicted by orthodox Marxism had not occurred by the early 20th century. Rather, capitalism seemed even more entrenched than ever. Capitalism, Gramsci suggested, maintained control not just through violence and political and economic coercion, but also ideologically, through a hegemonic culture in which the values of the bourgeoisie became the "common sense" values of all. (Taken from: Political Professor, Antonio Gramsci, http://www. politicsprofessor. com/politicaltheorists/antonio-gramsci. php. )