The Congressional Post Office scandal was the discovery of corruption among various Congressional Post Office employees and members of the United States House of Representatives, investigated 1991–1995, culminating in House Ways and Means Committee chairman Dan Rostenkowski (D-IL) pleading guilty in 1996 to reduced charges of mail fraud.
Initially an investigation by the United States Capitol Police into a single embezzlement charge against a single employee, evidence rapidly led to the inclusion of several other employees, before top Democrats in the House of Representatives moved to shut down the whole line of inquiry, despite protests from Frank Kerrigan, chief of the Capitol Police.
A new investigation was started by the United States Postal Service, which eventually submitted a report to Congress.
This was held by Speaker Tom Foley (D-WA) until media reports of embezzlement and money laundering leaked in 1992.
They were accused of heading a conspiracy to launder Post Office money through stamps and postal vouchers.