Pietro Grasso ( ; born 1 January 1945 ) , also known as Piero Grasso , is an Italian anti-mafia magistrate and politician who has been President of the Italian Senate since 16 March 2013 .
Pietro Grasso ( ] ; born 1 January 1945 ) , also known as Piero Grasso , is an Italian anti-mafia magistrate and politician who has been President of the Italian Senate since 16 March 2013 .