Francesco de Martino was an Italian jurist, politician, lifetime senator (1991–2002) and former Vice President of the Council of Ministers. He was considered by many to be the conscience of the Italian Socialist Party.

Pietro Sandro Nenni was an Italian socialist politician, the national secretary of the Italian Socialist Party (PSI) and senator for life since 1970. He was a recipient of the Lenin Peace Prize in 1951. He was one of the founders of the Italian Republic and a central figure of the Italian political left from the 1920s to the 1960s.