Manassas Battlefield Protection Act: With Representative Michael Andrews (D-TX), Mrazek led the fight in the House of Representatives to prevent the Civil War battlefield at Manassas, Virginia, from being turned into a shopping mall. In April, 1988, he inserted an amendment into an appropriations bill that prohibited federal funds from being used to plan and design a needed interchange near the tract of land. He and Andrews then introduced H.R. 4526, which authorized the federal government to acquire the land and add it to the battlefield park. In the contentious battle over the legislation, Donald Hodel, President Ronald Reagan's Secretary of the Interior, launched personal attacks on Mrazek and Andrews, accusing them of "playing politics" with the battlefield. Nevertheless, the bill drafted by Mrazek was signed into law by President Ronald Reagan in November, 1988.