 Complete the following phrase:  Just as American police films, American crime thrillers, and American vigilante films of the time focused on the crime waves and urban decline in the United States of the 1960s and 1970s, poliziotteschi were set in the context of, or directly addressed, the sociopolitical tumult and violence of Italys anni di piombo, or the Years of Lead, a period of widespread social unrest, political upheaval, labor unrest, rising crime, political violence, and political terrorism from the 1960s to 1980s. During this period, paramilitary and militant political terrorist groups, both on the far left e.g. the Red Brigades and far right e.g. the neo-fascist Nuclei Armati Rivoluzionari engaged in kidnappings, assassinations, and bombings such as the 