In cities across the country, highways have been blocked, trains have been delayed and sections of college campuses have been shut down by hundreds of thousands of people who have taken to the streets. They’re protesting Israel’s invasion of Gaza in response to Hamas’ Oct. 7 terrorist attack. Members of the movement say the size of the demonstrations is a response to the killing of more than 30,000 Palestinians in Gaza, according to the Palestinian Health Ministry. Pro-Israel groups, meanwhile, are pushing Congress and federal law enforcement agencies to investigate whether any of the protests across the U.S. are getting...