The online activist group “anonymous,” which has used coordinated denial of service attacks — a crude but effective Internet weapon — to temporary disable sites belonging to foes ranging from Scientology to WikiLeaks foes — has turned its firepower on the Koch-backed conservative group Americans for Prosperity, making the group’s site intermittently unavailable tonight.

Why?

Here is the press release.

It has come to our attention that the brothers, David and Charles Koch–the billionaire owners of Koch Industries–have long attempted to usurp American Democracy. Their actions to undermine the legitimate political process in Wisconsin are the final straw. Starting today we fight back.

Koch Industries, and oligarchs like them, have most recently started to manipulate the political agenda in Wisconsin. Governor Walker’s union-busting budget plan contains a clause that went nearly un-noticed. This clause would allow the sale of publicly owned utility plants in Wisconsin to private parties (specifically, Koch Industries) at any price, no matter how low, without a public bidding process. The Koch’s have helped to fuel the unrest in Wisconsin and the drive behind the bill to eliminate the collective bargaining power of unions in a bid to gain a monopoly over the state’s power supplies.

The Koch brothers have made a science of fabricating ‘grassroots’ organizations and advertising campaigns to support them in an attempt to sway voters based on their falsehoods. Americans for Prosperity, Club for Growth and Citizens United are just a few of these organizations. In a world where corporate money has become the lifeblood of political influence, the labor unions are one of the few ways citizens have to fight against corporate greed. Anonymous cannot ignore the plight of the citizen-workers of Wisconsin, or the opportunity to fight for the people in America’s broken political system. For these reasons, we feel that the Koch brothers threaten the United States democratic system and, by extension, all freedom-loving individuals everywhere. As such, we have no choice but to spread the word of the Koch brothers’ political manipulation, their single-minded intent and the insidious truth of their actions in Wisconsin, for all to witness.

Anonymous hears the voice of the downtrodden American people, whose rights and liberties are being systematically removed one by one, even when their own government refuses to listen or worse – is complicit in these attacks. We are actively seeking vulnerabilities, but in the mean time we are calling for all supporters of true Democracy, and Freedom of The People, to boycott all Koch Industries’ paper products. We welcome unions across the globe to join us in this boycott to show that you will not allow big business to dictate your freedom.

In response, Americans for Prosperity’s President Tim Phillips has issued the following:

Americans for Prosperity has established itself as a leading voice in one of the great political debates underway in this country over government spending and how best to restore the fiscal solvency of governments at both the state and federal level. Yesterday, a group claimed credit for an attempt to silence our voice and to stifle that debate through an illegal attack on our website. While the political debate over government spending can be heated, we hope that even our opponents will join us in condemning this illegal attack on our free speech rights as unacceptable and irredeemable. Our country cannot meet the great challenges before us if we cannot have a free and open discussion about the threats that we face.

Americans for Prosperity will not be intimidated and will not be deterred from our effort to support responsible economic policies, including the efforts of Governor Walker and other democratically elected leaders in that state to balance the budget through common-sense reforms.