welcome to the whole story, i m anderson cooper. since the october 7th terror attack on israel and the war that followed, there has been a spike on anti-semitic attacks around the world, including in the united states. the fbi recently warned anti-semitism is reaching historic levels. it s data shows jewish americans make up 2.4% of the public, but they are the targets of more than 60% of religious hate crimes recorded in this country. since october, jewish day schools have closed or had to hire extra security, synagogues have gone into lockdown and college campuses in particular have seen a surge in anti-semitic incidents, including some assaults. over the next hour, cnn s dana bash explores the roots of anti-semitism in america and how they ve spread. you ll also hear from some who personally experienced threats and attacks in the past month and have started hiding their jewish identity in public out of fear for their safety. reporter: sunday, october 29th, in souther