What act has been described as having been "passed in response to a largely undefined threat from a poorly understood source"?

Question

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The USA PATRIOT Act was passed in response to the 9/11 attacks, which were carried out by terrorists who were largely unknown to U.S. authorities at the time. The Act was aimed at improving the ability of law enforcement agencies to prevent and investigate acts of terrorism, but it has been criticized for being overly broad and infringing on civil liberties.

What Act Has Been Described as Having Been "Passed in Response