A mural dedicated to an Italian volleyball star has been defaced with racist graffiti by unknown perpetrators, authorities in Rome said on Tuesday. The work depicting Paola Egonu, who was part of Italy’s gold medal-winning volleyball team at the Paris Olympics, was vandalized on Monday night, hours after it was installed in front of the headquarters of the Italian National Olympic Committee. In the piece, Egonu – who was born in northern Italy to two Nigerian immigrants and has been an Italian citizen since 2014 – is shown taking a serve, with the colours of the Italian flag and the word “Ital…