Former Israeli Air Force captain and Israel boycott activist Yonatan Shapira spray-painted pro-Palestinian graffiti on the walls of the Warsaw Ghetto last week, Channel 10 reported on Sunday.Shapira was shown on camera the previous Sunday spraying the slogans “Free all ghettos” and “Free Palestine and Gaza” on the walls of the Jewish ghetto in the Polish city – famed site of Jewish resistance to the Nazis – and then hoisting upon the wall a Palestinian flag on a rope with a bottle attached at the end that he threw over the other side.