The grassroots group ACORN announced Tuesday it had filed for Chapter 7 bankruptcy protection, meaning the group has effectively folded.

Bertha Lewis, the CEO of the Association of Community Organizations for Reform Now (ACORN), wrote that the group had filed for protection under the section of U.S. bankruptcy code that calls for the liquidation of an organization.

"We have seen this coming for some time. Our chapters closed in the first quarter of the year. We have spent our remaining resources trying to dissolve the organization with integrity, while continuing to respond to the extremist attacks," Lewis wrote. "Allegations and reports will continue to try to undermine all that ACORN has done, often searching for evidence from long before I became CEO."

ACORN had been a punching bag for conservatives who, for the past two years, had accused the group of fraudulently registering voters to help boost President Obama into August. The group became ensnared in additional controversy after conservative filmmaker and provocateur James O'Keefe secretly recorded ACORN officials allegedly advising a young woman posing as a prostitute on how to evade taxes.

The controversies led Republicans in Congress to introduce legislation to cut federal funding for some of ACORN's other community organizing activities.

Lewis lashed out at conservatives in her farewell message on Tuesday.

"The ongoing political onslaught caused irreparable harm. This effort was a clear attempt to cast a shadow over the historic 2008 Presidential election, and set up a far right counter offense. Through those attacks we re-tooled and re-organized," she said. "Then again came the right-wing media blitz. This time of edited videos that misrepresented our mission, and consequently misled the public. The pressure and cost of defending ourselves in multiple investigations as a result of the falsified videos has eroded our organization."