SAN DIEGO -- The 10News I-Team took a deeper look at ACORN and found that the non-profit group has had past problems, including allegations of supporting prostitution.

The I-Team learned that there have been previous accusations of abuse and corruption, with the accusers being members of Congress.

Undercover video capturing ACORN staff members in San Diego -- as well as in several other cities around the U.S. -- helping women they thought were prostitutes has placed a bright spotlight on the group, this time from the investigative arm of the U.S. House of Representatives.

"The members of this House do not support ACORN's activities, including child trafficking, prostitution and a great many criminal activities, including voter fraud," said Rep. Darrell Issa (R-Calif.), who is the ranking member on the bipartisan Committee on Oversight and Government Reform.

The I-Team found a report by the committee that concluded "ACORN represents a politically partisan lobbying organization" and that "ACORN has evaded taxes, obstructed justice, engaged in self dealing and aided and abetted a cover-up of embezzlement." Additionally, the committee said that "ACORN has committed a conspiracy to defraud the United States by using taxpayer funds for partisan political activities."

ACORN owes the Internal Revenue Service $800,000, according to I-Team research.

On its Web site, ACORN said it "does not apply for or receive any federal funding." Instead, the group said it works with other non-profits who do.

Despite the claim, the Senate and House of Representatives voted to deny ACORN federal funding.

"The severity of the allegations and the alleged corruption is just shocking," said Ron Nehring, who chairs the California Republican Party.

San Diego-area Republicans are using the allegations to pounce on the issue of voter fraud.

They say ACORN may have illegally registered thousands of voters in San Diego County for the 2008 election, and they are asking for an investigation.

ACORN Executive Director Bertha Lewis said they are going to name an independent auditor and investigator to conduct a thorough review of all the organization's relevant systems and processes. She said, "For nearly 40 years, ACORN has given voice to communities and gotten results."

ACORN has helped more than one million people find homes since 2006, but the I-Team learned that 70 ACORN employees who have been convicted in 12 states for voter fraud by registering some to vote illegally.