The Halo Act creates a new federal crime for obstructing immigration enforcement activities. Specifically, it makes it illegal for a person to approach within 25 feet of a federal immigration officer after being warned to stay back, if the person's intent is to interfere with the officer's duties, threaten them with physical harm, or harass them in a way that causes substantial emotional distress. The law applies to federal immigration officers from agencies like ICE and CBP who are lawfully performing their duties. Violators face up to 5 years in prison and fines. The bill does not specify funding amounts or implementation timelines beyond directing amendments to the U.S. criminal code.