The Blocking Leaks Undermining Enforcement Act, or the BLUE Act , aims to protect federal law enforcement officers by prohibiting the unauthorized sharing of their personal information. It amends section 119 of title 18, United States Code, to expand the scope of prohibited actions regarding the dissemination of such data. Specifically, the bill makes it unlawful to share personally identifiable information about a federal law enforcement officer with the intent to physically obstruct, impede, interfere with, or retaliate against any lawful duty, investigation, operation, or official proceeding involving that officer. This prohibition also extends to aiding others in such obstructive or retaliatory acts. Furthermore, the definition of "personally identifiable information" is broadened to include any physical location where an officer is or is reasonably expected to be present, whether on or off duty.