The group’s leaders have consistently denied any wrongdoing and previously said they welcomed a congressional probe.
The group did not respond to questions about Mr. Conyers being convinced to drop those plans.
Ms. Heidelbaugh, who spearheaded an unsuccessful lawsuit last year to stop ACORN’s Pennsylvania voter-registration drive, testified in March that the nonprofit group was violating tax, campaign-finance and other laws by, among other things, sharing with the Barack Obama campaign a list of the Democrat’s maxed-out campaign donors so ACORN could use it to solicit them for a get-out-the-vote drive.
ACORN also provided liberal causes with protest-for-hire services and coerced donations from targets of demonstrations through a shakedown it called the “muscle for the money” program, said Ms. Heidelbaugh, a member of the executive board of the Republican National Lawyers Association.
Mr. Conyers, a fierce partisan known for his drive to continue investigating President George W. Bush’s administration, had been an unlikely champion for opponents of ACORN.
Before calling for the probe, he frequently defended ACORN. In October, he condemned an FBI voter-fraud investigation targeting the group, questioning whether it was politically motivated to hamper a voter-registration likely to turn out supporters for Mr. Obama’s candidacy.
But in March, Mr. Conyers dismissed the argument made by fellow Democrats that accusations of voter fraud and other crimes should be explored by prosecutors and decided in court, not by lawmakers in Congress.
“That’s our jurisdiction, the Department of Justice,” Mr. Conyers said in March. “That’s what we handle voter fraud. Unless that’s been taken out of my jurisdiction and I didn’t know it.”
Steven A Miller
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