After the war, Maas served with the Marine Corps until 1925, when he received a Marine Corps commission and left active service, subsequently transferring to the
Marine Corps Reserve. During that time, he also finished his studies at
St. Thomas College in St. Paul and graduated in 1919. Maas later attended the
University of Minnesota in Minneapolis and subsequently joined his brothers in the insurance business. During
Prohibition, Maas became involved in the anti-Prohibition platform, calling for the modification of Prohibition to allow beer and wine drinking. He subsequently ran for Congress in 1926 and defeated incumbent Oscar Keller. He became the youngest member of Congress at age twenty-eight on November 2, 1926. Maas was subsequently elected as a
Republican to the
70th,
71st, and
72nd Congresses (March 4, 1927 – March 3, 1933). He ran unsuccessfully for renomination in 1932.
A Gunman in the House Gallery On December 13, 1932, a 25-year-old department store clerk, Marlin Kemmerer, from
Allentown, Pennsylvania, pulled a gun in the House visitors' gallery and demanded to address the House regarding the nation's economic
depression. As members fled the chamber, Maas stood his ground and shouted to the man that no one was allowed to speak in the House while carrying a weapon and demanded that he throw it down. The man did so, was promptly arrested, and escorted from the House Chamber by police. For this act of courage, Maas received the
Carnegie Medal. As a Marine Corps Reservist, Mass maintained proficiency as an Aviator at NRAB Minneapolis, flying with VO-6MR. On 24 September 1938, FF-2, BuNo 9365 was damaged beyond economical repair during a regularly scheduled training flight. With Col. Melvin J. Maas at the controls, the aircraft suffered strike damage after hitting a bump on the runway during takeoff from NRAB Minneapolis. The aircraft became airborne with insufficient flying speed and settled back to the ground with the left wheel collapsing. The right wheel also collapsed, and the left wingtip dug into the ground, causing the aircraft to nose up to a nearly vertical orientation before settling upright. Maas received minor cuts and bruises while passenger, Pvt. S. Jaroseak, Jr. was unhurt. The aircraft suffered major damage to the engine and cowling and was stricken as a result. ==World War II==