Yes of course, providing they are the kind of unsecured debts for which the Liberty system is designed — as specified elsewhere — i.e. issued by U.S. institutions, not secured by collateral, etc. Just because it went to a 2nd or 3rd or 4th party collector means nothing. It doesn’t matter who bought it and who is trying to collect on it. If it was a fraud in the beginning, it continues to be a fraud. Fraud nullifies debt ab initio (from the beginning).