1928The Coast Guard fired shells across a dragger in a chase around Thacher Island looking for illegal alcohol.Economy and Industry, Government and Public Service, Maritime & Fishing Industry, Crime

The Mao IV, a converted submarine chaser, was spotted by the Coast Guard when trying to unload its illicit cargo to the rum-runner schooner Thorndike. The Coast Guard chased the trawler and eventually fired over her bow to stop the vessel. The illegal liquor was found in 5-gallon tins the hatch and fish bins were covered with ice.