Who is Mussolini, Hitler from War in Val D'Orcia, 1943-1944 and what is their importance?

Mussolini, Hitler were dictators, who in their desire to dominate made a practice of brutality and genocide, which in turn, were the primary instigators of World War II. Mussolini was a fascist; Hitler was a Nazi; their alliance brought death and destruction to large portions of Europe.