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WASHINGTON (WUSA9) -- A longtime Washington, D.C. businessman and his son pleaded guilty Wednesday scheming to illegally generate business through the District of Columbia taxicab industry.

Anthony Cheng, Sr., 65, and his son, 40, both of Alexandria, Va., face up to six months in jail and fines of up to $5,000.

Anthony Cheng, Sr. pleaded guilty to a misdemeanor charge of making an offer of unauthorized compensation to a public official, according to the U.S. Attorney's office for the District of Columbia. Anthony Cheng, Jr. pleaded guilty to a felony charge of payment of a gratuity to a public official.

The charges involve the Chengs' dealings in 2010 and 2011 with a person described in the court documents as "Public Official Number One," who at the time chaired the District of Columbia Taxicab Commission, according to officials. Unbeknownst to the Chengs, "Public Official Number One" was working in cooperation with the FBI on an investigation.

"With today's guilty pleas, a financially successful father and son confessed to their efforts to pay off public officials to advance their business interests," U.S. Attorney Ronald Machen said in a statement.

According to plea documents filed today, Anthony Cheng, Sr. is the owner of businesses, including Tony Cheng's Mongolian Restaurant, in the Chinatown area of Washington, D.C. His son owned a bus company that provided interstate transportation to the public.

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