Karl LNU, who asked that I not use his last name (LNU stands for last name unknown – or in this case unused), was investigated, charged and convicted of bribing corrupt purchasing agents to approve invoices for over-priced and inferior lighting and maintenance supplies. In this episode of FBI Retired Case File Review, we review the case and how Karl, his business partner and their employees made telemarketing calls to unsuspecting businesses throughout the United States and ripped them off with the help of their own greedy employees. Karl pled guilty and served time for business to business telemarketing fraud, but his sentence was reduced significantly based on his decision to become a cooperating witness, assisting a multi-agency Group II undercover investigation targeting the business to business telemarketing fraud industry in the Philadelphia area. This was one of my economic crime cases. The investigation, worked in partnership with the U. S. Postal Inspection Service (USPIS) and with assistance from the Internal Revenue Service Criminal Investigative Division (IRS-CID), resulted in 16 search warrants and 25 convictions.


Karl LNU

Cooperating Witness

Business to Business Telemarketing Fraud












Here’s a pdf. compiling several news articles about separate Operation Duct Tape telemarketing fraud cases:





This giant script, which was to be recited verbatim, was on display and seized from one of the companies searched and charged with business to business telemarketing fraud by the Operation Duct Tape team.


















Operation Duct Tape’s original team – Assistant United States Attorney (AUSA) Mitch Goldberg (now Federal Judge), Postal Inspector Ed Matyas, me, and AUSA Jeff Whitt.















The Bellmawr, NJ warehouse (mice not shown) where the team stored and reviewed evidence gathered during long-term undercover case.















The multi-agency team of agents and professional support staff were awarded Certificates of Appreciation by United States Attorney (USA-EDPA) Pat Meehan (now U. S. Congressman) for our dedicated , innovative and tireless efforts in the investigations and prosecutions in the telemarketing fraud Group II Undercover Case – Operation Duct Tape in November of 2004.

















Jerri Williams, a retired FBI agent, author and podcaster, attempts to relive her glory days by writing crime fiction and hosting FBI Retired Case File Review, a true crime podcast available for subscription on iTunes and Stitcher. Her debut novel—Pay To Play— about a female agent investigating corruption in the Philadelphia strip club industry is available now at 


This episode was sponsored by – the only on-line directory made available to the general public featuring “retired” FBI AGENTS / ANALYSTS interested in showcasing their skills to secure business opportunities. Logo



  Nov 18, 2016

Author and Podcaster

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