Anti-hate groups and civil rights organizations vowed this week to strengthen their resolve against hate speech on social media, saying they would not be intimidated by threats of lawsuits from tech billionaire Elon Musk. Leaders of several organizations told NBC News that they were gearing up for a long fight with Musk over his management of X, the app formerly known as Twitter. As the app’s owner for nearly a year, Musk has loosened the rules around hate speech and granted a “general amnesty” to many people previously banned, including for posting antisemitism. Musk has been picking fights with nonprofit...