Far-left and pro-Palestine extremists mobilized at Columbia University last week for an occupation that’s shut down campus. Promoters of revolutionary “direct action” chanted explicitly in support of Hamas and urged the Palestinian Islamist terror group to “Burn Tel Aviv to the ground.” Over the weekend, a group of pro-Israel counterprotesters were met by a keffiyeh-wearing woman who held up a sign and arrow declaring: “Al-Qasam’s next targets.” Al-Qassam Brigades is the Hamas military wing that led the Oct. 7 terrorist attacks in Israel. Occupations have spread to dozens of higher-educational institutions across North America, becoming violent — and more organized....