If you've gotten a threatening call from any of these alleged parties lately, it's likely you're a scam target: U.S. National Bank, Federal Investigation Bureau and United Legal Processing, Denzel Washington, and Steve Martin, have all been used by a group of scammers pretending to be debt collectors. They use classic intimidation tactics like impending arrest if victims don't pay their (non-existent) debts and calling people at any available number.
It probably doesn't help the scammers' cause that when using names like Denzel and Steve, they speak in what prosecutors call heavy foreign accents. However, officials with the West Virginia Attorney General's Office say the harassment has been financially lucrative to the disguised debt collectors who have managed to get thousands from victims. Officials have a difficult investigation on their hands, as so far they've been unsuccessful in tracking down any of the scammers.