A law firm that mass-produced collection letters and litigation documents violated the federal debt collection act in a matter it filed a decade ago, a federal judge has ruled.

In August 2000, Upton, Cohen & Slamowitz, which is now known as Cohen & Slamowitz, sued Arthur Miller, after he failed to respond to a letter signed by Michael Slamowitz. The letter gave Miller 30 days to contest a $1,678 balance he owed on a Lord & Taylor credit card.