Washington ? The Census Bureau has severed its ties with ACORN, a community organization that has been hit with Republican accusations of voter-registration fraud.

“We do not come to this decision lightly,” Census director Robert Groves wrote in a letter to ACORN, which was obtained by The Associated Press.

In splitting with ACORN, Groves sought to tamp down GOP concerns and negative publicity that the partnership will taint the 2010 head count.

Stephen Buckner, a census spokesman, confirmed the letter, but declined to give additional comment last week. ACORN spokesman Scott Levenson did not immediately return a request for comment.

In recent months, Republicans have become increasingly critical of the census’ ties with ACORN, which stands for the Association of Community Organizations for Reform Now. The group, which advocates for poor people, conducted a massive voter registration effort last year and became a target of conservatives when some employees were accused of submitting false registration forms with names such as “Mickey Mouse.”

ACORN has said only a handful of employees submitted false registration forms and did so in a bid to boost their pay.

In hidden-camera video released Monday, two ACORN employees are shown apparently advising a couple posing as a prostitute and her pimp to lie about her profession and launder her earnings.

The video was the latest in a series that has already led to the firing of four ACORN employees in Baltimore and Washington, D.C. It was created by James O’Keefe and Hannah Giles and posted on BigGovernment.com, where O’Keefe identifies himself as an activist filmmaker.

ACORN spokesman Scott Levenson blasted the video shot at the organization’s Brooklyn office, saying the group believes the voices of the couple were dubbed over to alter the conversation and make the interaction appear more objectionable than it may have been.