Trucking company owners sentenced in Postal Service kickback scheme

USPS employees also sent to prison for taking bribes

Four defendants in a bribery scheme involving U.S. Postal Service trucking contractors were sentenced to a combined 99 months in federal prison, the U.S. Attorney for the Northern District of Texas announced Tuesday.

According to court documents, a former senior network analyst for the Postal Service, Zechariah Yi of Aurora, Colorado, and a second USPS employee, Tai Ryoung Rho, also of Aurora, pled guilty to a bribery scheme in which they solicited and received approximately $1.5 million in kickbacks from the owners and associates of multiple trucking companies in exchange for agreeing to help the trucking companies obtain USPS service contracts worth approximately $15 million over a six-year period, beginning in 2015.

Wan Jin Yoon, who owned Assured Trucking Inc. and Postal Box Inc., and Hong Jin Yoon of Denver, who owned JY Logistics, obtained the USPS contracts under the bribery scheme. The payments were laundered through a third individual to Yi and Rho. Rho, Wan Yoon, and Hong Yoon each pled guilty to conspiracy to commit honest services wire fraud.  Yi pled guilty to receiving a bribe from a public official.

Wan Jin Yoon is related to Yi, according to court documents.

In late May, U.S. District Judge Karen Gren Scholer imposed sentences ranging from 24 to 42 months for three defendants. Hong YUoon was sentenced to three months in prison. The defendants also agreed to forfeit two vehicles and more than $300,000 cash.  

“At the expense of the integrity and fairness of the government contracting process, these defendants resorted to bribery and corruption simply to line their own pockets,” said U.S. Attorney Ryan Raybould, in a statement. 

“The public must have confidence that Postal Service employees will conduct their work in an honest manner,” said Kevin Cloninger, executive special agent in charge, U.S. Postal Service Office of Inspector General. “When employees commit serious offenses, such as taking bribes, they will be aggressively investigated and prosecuted.”

The FBI assisted with the investigation.

Click here for more FreightWaves/American Shipper stories by Eric Kulisch.

Write to Eric Kulisch at ekulisch@freightwaves.com.

Postal Service can proceed with 8% parcel surcharge, regulator says

US Postal Service on brink of financial collapse, chief tells Congress

Amazon overtakes US Postal Service as largest parcel carrier

How DHL tackled mail and parcel boom during peak Easter season

Upcoming FreightWaves Events
Fraud & Security

Freight Fraud Symposium

Double brokering. AI deepfakes. Identity theft. Freight fraud is an existential threat to the industry. Get ahead of it.

May 20, 2026
Rock & Roll Hall of Fame • Cleveland, OH
Register Now
AI & Technology

Supply Chain AI Symposium

Past the hype. Join operators, founders, and enterprise leaders figuring out how to deploy AI in supply chain.

July 15, 2026
The Old Post Office • Chicago, IL
Register Now
Rail & Policy

Future of Rail Symposium

Reshoring is rewriting freight demand. Join shippers, rail executives, and government officials to shape the next decade.

July 28, 2026
The Signal at Chattanooga Choo Choo • Chattanooga, TN
Register Now
Fraud & Security Freight Fraud Symposium May 20 • Cleveland, OH

Double brokering. AI deepfakes. Identity theft. Freight fraud is an existential threat to the industry. Get ahead of it.

Rock & Roll Hall of Fame • Cleveland, OH Register Now
AI & Technology Supply Chain AI Symposium Jul 15 • Chicago, IL

Past the hype. Join operators, founders, and enterprise leaders figuring out how to deploy AI in supply chain.

The Old Post Office • Chicago, IL Register Now
Rail & Policy Future of Rail Symposium Jul 28 • Chattanooga, TN

Reshoring is rewriting freight demand. Join shippers, rail executives, and government officials to shape the next decade.

The Signal at Chattanooga Choo Choo • Chattanooga, TN Register Now

Eric Kulisch

Eric is the Parcel and Air Cargo Editor at FreightWaves. An award-winning business journalist with extensive experience covering the logistics sector, Eric spent nearly two years as the Washington, D.C., correspondent for Automotive News, where he focused on regulatory and policy issues surrounding autonomous vehicles, mobility, fuel economy and safety. He has won two regional Gold Medals and a Silver Medal from the American Society of Business Publication Editors for government and trade coverage, and news analysis. He was voted best for feature writing and commentary in the Trade/Newsletter category by the D.C. Chapter of the Society of Professional Journalists. He was runner up for News Journalist and Supply Chain Journalist of the Year in the Seahorse Freight Association's 2024 journalism award competition. In December 2022, Eric was voted runner up for Air Cargo Journalist. He won the group's Environmental Journalist of the Year award in 2014 and was the 2013 Supply Chain Journalist of the Year. As associate editor at American Shipper Magazine for more than a decade, he wrote about trade, freight transportation and supply chains. He has appeared on Marketplace, ABC News and National Public Radio to talk about logistics issues in the news. Eric is based in Vancouver, Washington. He can be reached for comments and tips at ekulisch@freightwaves.com