Larry Merovka was appointed as a U.S. Deputy Game Warden in 1924, a time of rampant market hunting that decimated waterfowl populations. In 1929 he became a U.S. Game Warden for northern Mississippi, Alabama, and western Tennessee. He was in charge of federal game enforcement in Louisiana from 1933 to 1940, a time of epidemic political corruption and widespread market hunting. His focused efforts there yielded great success: the widespread reduction in illegal harvests of waterfowl.
He retired from the U.S. Fish and Wildlife Service in 1965, after serving twenty five years as the Regional Supervisor of Law Enforcement in Albuquerque, New Mexico.