Thiago Ávila, a Brazilian activist sailing to Gaza alongside Greta Thunberg on the “Freedom Flotilla,” has a long record of anti-Israel radicalism—including attending the funeral of slain Hezbollah leader Hassan Nasrallah.Ávila is currently on board the Madleen, a 59-foot boat carrying Thunberg and other activists that is approaching Israeli waters in an attempt to sail to Gaza. The group, which has been mocked as the “selfie flotilla,” is using…