With overwhelming bipartisan support, Rep. Jane Harman's Violent Radicalization and Homegrown Terrorism Prevention Act" passed the House 404-6 late last month. Swift Senate passage appears certain. Not since the "Patriot Act" of 2001 has any bill so threatened our constitutionally guaranteed rights. Diverse groups vigorously oppose Ms. Harman's effort to stifle dissent. Unfortunately, the mainstream press and leading presidential candidates remain silent. Ms. Harman ... thinks it likely that the United States will face a native brand of terrorism in the immediate future and offers a plan to deal with ideologically based violence. But her plan is a greater danger to us than the threats she fears. Her bill tramples constitutional rights by creating a commission with sweeping investigative power and a mandate to propose laws prohibiting whatever the commission labels "homegrown terrorism." The proposed commission is a menace through its power to hold hearings, take testimony and administer oaths, an authority granted to even individual members of the commission - little Joe McCarthys - who will tour the country to hold their own private hearings. Ms. Harman's proposal includes an absurd attack on the Internet ... and legalizes an insidious infiltration of targeted organizations. While Ms. Harman denies that her proposal creates "thought police," it defines "homegrown terrorism" as "planned" or "threatened" use of force to coerce the government or the people in the promotion of "political or social objectives." That means that no force need actually have occurred as long as the government charges that the individual or group thought about doing it. Any social or economic reform is fair game. The bill defines "violent radicalization" as promoting an "extremist belief system." But American governments, state and national, have a long history of interpreting radical "belief systems" as inevitably leading to violence to facilitate change.