Upon entry to World War I, the U.S. government took over control of the Hamburg-American Line piers in Hoboken under eminent domain, and Hudson became the major point of embarkation for more than three million soldiers, known as "doughboys". In 1916, an act of sabotage literally and figuratively shook the region when German agents set off bombs at the munitions depot in New York Bay at Black Tom. The fore-runner of Port Authority of New York and New Jersey was established on April 30, 1921. Huge transportation projects opened between the wars: The Holland Tunnel in 1927, The Bayonne Bridge in 1931, and The Lincoln Tunnel in 1937, allowing vehicular travel between New Jersey and New York City to bypass the waterfront. Hackensack River crossings, notably the Pulaski Skyway, were also built. What was to become New Jersey City University opened. Major Works Progress Administration projects included construction of stadiums in Jersey City and Union City. Both were named for President Franklin D. Roosevelt, who attended the opening of the largest project of them all, The Jersey City Medical Center, a massive complex built in the Art Deco Style. During this era the "Hudson County Democratic Machine", known for its cronyism and corruption, with Jersey City mayor Frank Hague at its head was at its most powerful. Industries in Hudson were crucial to the war effort during WWII, including the manufacture PT boats by Elco in Bayonne. Military Ocean Terminal at Bayonne (MOTBY) was opened in 1942 as a U.S. military base and remained in operation until 1999.