Anti-Zionist Jews burning the Israeli flag during celebrations of the Jewish holiday of Lag BaOmer in ultra-orthodox neighborhood of Mea Shearim in Jerusalem on May 2, 2018. Lag BaOmer commemorates the death of Rabbi Shimon Bar Yochai, one of the most important sages in Jewish history 1800 years ago. A well-known custom of Lag BaOmer is the lighting of bonfires in many Jewish communities worldwide.