At one of the club 's meetings , Piero Sraffa , a friend of Antonio Gramsci , advised him to read Karl Marx .
Simon soon joined the Communist Party , as his brother Brian Simon had done a year before .
At one of the club 's meetings , Piero Sraffa , a friend of Antonio Gramsci , advised him to read Karl Marx , and Simon soon joined the Communist Party , as his brother Brian Simon had done a year before .