High Quality Content by WIKIPEDIA articles! Pietro Sandro Nenni (February 9, 1891, Faenza, Emilia-Romagna – January 1, 1980) was an Italian socialist politician, the national secretary of the Italian Socialist Party (PSI) and lifetime Senator since 1970. He was a recipient of the Stalin Peace Prize in 1951. He was a central figure of the Italian left from the 1920s to the 1960s.