Question

How can citizens protect civil liberties?

Answer 1

Civil liberties protect us from government power. They are rooted in the Bill of Rights, which limits the powers of the federal government. The government cannot take away the freedoms outlined in the Bill of Rights, and any action that encroaches on these liberties is illegal.
Here you go :)

Answer 2

authorizing the indefinite incarceration of non-citizens based on mere suspicion, and the indefinite incarceration of citizens designated as "enemy combatants" without access to counsel or meaningful recourse to the federal courts;

(b) limiting the traditional authority of federal courts to curb law enforcement abuse of electronic surveillance in anti-terrorism investigations and ordinary criminal investigations;

(c) expanding the authority of federal agents to conduct so-called "sneak and peek" or "black bag" searches, in which the subject of the search warrant is unaware that his property has been searched;

(d) granting law enforcement and intelligence agencies broad access to personal medical, financial, library and education records with little if any judicial oversight;

(e) chilling constitutionally protected speech through overbroad definitions of "terrorism";