Killer Cop (Italian: La polizia ha le mani legate) is a 1975 Italian poliziottesco-crime film directed in 1975 by Luciano Ercoli. The film's plot reprises the Piazza Fontana bombing which happened in Milan in 1969. The gun in the umbrella used in the movie is similar to a Bulgarian umbrella used at London in 1978 to kill Bulgarian dissident Georgi Markov.