What Act was signed into law to monitor terrorist activities following the 9/11 attacks?

The USA PATRIOT Act was signed into law in response to the terrorist attacks on September 11, 2001, with the primary aim of enhancing law enforcement's abilities to prevent and investigate terrorism. This legislation provided government agencies with greater surveillance powers, allowing for increased monitoring of communications and financial transactions, which were deemed necessary to track and thwart potential terrorist activities.

One of the key components of the USA PATRIOT Act was the expansion of the government's authority to conduct intelligence gathering through various means, such as roving wiretaps and access to business records. It aimed to address vulnerabilities in national security and improve the sharing of information between agencies to create a more cohesive response to threats.

The other choices pertain to different contexts: the USA FREEDOM Act, which was enacted in 2015, aimed to reform some of the surveillance practices established by the USA PATRIOT Act; the Privacy Protection Act deals with the rights of individuals regarding their information and media in certain situations; and the Cybersecurity Information Sharing Act focuses on enhancing the sharing of cybersecurity threat information between the government and private sector. Each addresses unique aspects of privacy and security but does not directly relate to the immediate response following the events of 9/11.