Hamilton Fish was a fervent anti-communist; in a 1931 article, he described communism as "the most important, the most vital, the most far-reaching, and the most dangerous issue in the world" and believed that there was extensive communist influence in the United States.
On December 21, 1920, Congressman Hamilton Fish introduced legislation which was to be among his most enduring and patriotic acts as a member of Congress. It was Resolution 67 of the 66th Congress which provided for the return to the United States the remains of an unknown American soldier killed in France during World War I and for interment of his remains in a hallowed tomb to be constructed outside the Memorial Amphitheater in Arlington National Cemetery in Arlington, Virginia across the Potomac River from the nation's capital. The Congress approved the resolution on March 4, 1921. On October 23, 1921 at Châlons-sur-Marne, France, about 90 miles from Paris, remains of an unknown soldier were selected from among six caskets containing remains of unknown American soldiers killed in France. The selected remains were returned to the United States and interred at the tomb site in Arlington National Cemetery on November 11, 1921 in solemn ceremony following a state funeral procession from the U.S. Capitol building where the World War I Unknown had lain in state. The tomb, completed in 1937, came to be known as The Tomb of the Unknowns (Soldiers) which is today guarded around the clock daily by elite sentries of the U.S. Army's historic ceremonial but combat ready 3rd Infantry Regiment—"The Old Guard." The tomb, and unknown soldiers of three U.S. wars interred there today, is thought to be the most hallowed military site in the United States and may well be Fish's greatest legacy to the nation.
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The British Security Cooperation focused a great deal of effort attempting to influence Congressmen through front groups, campaigning, and agents of influence. In 1940, BSC agents ran the Nonpartisan Committee to Defeat Hamilton Fish in order to “put the fear of God into every isolationist senator and congressman.” The committee raised substantial sums of money for Fish’s opponent, coordinated several media attacks, created false charges of wrongdoing just before elections, and helped distribute books charging Fish with disloyalty. The committee as much as possible tried to make attacks on Fish appear to originate from his district though historical documents indicate most attacks originated outside of his district. Fish survived the attack in 1940 but won his election with less than half the margin of victory he earned 2 years earlier.
A cousin of Hamilton Fish III (also named ) was sergeant in Company L of 's "", and the first American soldier killed in action during the . At the age of ten, Hamilton Fish II had his son's name legally changed from to just to honor his fallen cousin (he and Hamilton Fish III never met).