Thaddeus Maclay Mahon (May 21, 1840 – May 31, 1916) was a soldier, attorney, railroad executive, and a Republican member of the U.S. House of Representatives from Pennsylvania.
During the American Civil War, he enlisted in August 1862 as a private in Company A, One Hundred and Twenty-sixth Regiment of the Pennsylvania Volunteers.
Mahon studied law, was admitted to the bar in 1871, and commenced practice in southern Pennsylvania.
He served as chairman of the United States House Committee on War Claims during the Fifty-fourth through the Fifty-ninth Congresses.
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