Immigration law and policy in the United States changed significantly after 9/11 in response to the terrorist attacks. The most sweeping change was the USA Patriot Act passed shortly after 9/11. This Act gave law enforcement more power to surveil communications and gather intelligence but also had negative impacts on immigrants. It allowed for indefinite detention of immigrants suspected of terrorism and increased discretion to detain and deport such individuals. Other policies following 9/11 included increased registration and fingerprinting requirements for certain non-citizens, specifically men within certain age groups. Overall, the USA Patriot Act and post-9/11 policies enhanced national security but also reduced protections and rights for some immigrants.