Concerns of Civil Liberties in the USA PATRIOT Act

In the wake of the September 11, 2001 terrorist attacks in the United States, significant shifts occurred in both domestic and international policies. One of the major legislative responses was the USA PATRIOT Act, which aimed to enhance law enforcement's ability to monitor and combat terrorism. However, this act also sparked debates concerning civil liberties and government overreach. What was one of the primary provisions of the PATRIOT Act that raised concerns regarding individual rights?