Investigation of a Citizen Above Suspicion
by Elio Petri (Indagine su un cittadino al di sopra di ogni sospetto, Italy, 1970, 1h55)
starring Gian Maria Volontè, Florinda Bolkan, Gianni Santuccio
Convinced that his position places him above the law, an important police chief murders his mistress and assiduously sets about planting devastating evidence against himself. But who would dare to suspect him, even for a moment? An implacable satire on Italian society and its institutions.