From a March 1 Daily News article:

Brooklyn prosecutors on Monday cleared ACORN of criminal wrongdoing after a four-month probe that began when undercover conservative activists filmed workers giving what appeared to be illegal advice on how to hide money.

While the video by James O'Keefe and Hannah Giles seemed to show three ACORN workers advising a prostitute how to hide ill-gotten gains, the unedited version was not as clear, according to a law enforcement source.

“They edited the tape to meet their agenda,” said the source.

Previously:

Investigation confirms: No evidence of illegal actions by ACORN in videographer scam