A Montana man Tuesday pleaded guilty to defrauding law firms involved in major litigation by claiming to have proof of illegal activity by opposing counsel and parties.

Michael Lair, 46, headed consumerdefense.com Inc., which held itself out as a consumer complaint investigator and researcher for large fraud cases. Tuesday, Lair admitted to defrauding attorneys and litigants of more than $311,000 in 2003 and 2006 as he pleaded guilty to four counts of wire fraud before Southern District of New York Judge John Keenan.