The Progressive Era (1890s to 1920s) saw numerous prominent leaders from Missouri trying to end corruption and modernize politics, government, and society. Joseph "Holy Joe" Folk was a key leader who made a strong appeal to the middle class and rural evangelical Protestants. Folk was elected governor as a progressive reformer and Democrat in the 1904 election. He promoted what he called "the Missouri Idea," the concept of Missouri as a leader in public morality through popular control of law and strict enforcement. He successfully conducted antitrust prosecutions, ended free railroad passes for state officials, extended bribery statutes, improved election laws, required formal registration for lobbyists, made racetrack gambling illegal and enforced the Sunday-closing law. He helped enact Progressive legislation, including an initiative and referendum provision, regulation of elections, education, employment and child labor, railroads, food, business, and public utilities. Several efficiency-oriented examiner boards and commissions were established during Folk's administration, including many agricultural boards and the Missouri library commission.