Although the injunction was an ancient legal device, it was not until after the Civil War that it was developed into a powerful instrument in industrial disputes; and it became particularly effective in the hands of Federal judges. They were not popularly elected, but were appointed by the President and the Senate (where corporate influences were ably represented). Under the provisions of the law giving Federal courts jurisdiction in cases involving citizens of different states, they were called upon to intervene with increasing frequency in industrial disputes, for railway and other corporations usually did business in several states, and they could generally invoke Federal protection by showing that they were "non-residents" of the particular states in which strikes were being waged. Moreover, strikers who interfered with interstate commerce were likely to collide with Federal authorities whose aid was invited by the employers affected. Whenever a corporation was in bankruptcy, control over its business fell into the hands of the Federal courts. The effectiveness of Federal judicial intervention in labor troubles became apparent in the first great strikes of the seventies, when the state authorities proved unable to restrain rioting and disorder by the use of the local militia. During the railway war of 1877 a Federal judge in southern Illinois ordered the workingmen not to interfere with a railway for which he had appointed a receiver, and he then employed Federal troops under the United States marshal to execute his mandate. About the same time other Federal judges intervened effectively in industrial disputes by the liberal use of the injunction, and the president of the Pennsylvania Railroad Company pointed out in an article published in the _North American Review_ for September, 1877, how much more potent Federal authority was in such trying crises to give railway corporations efficient protection. From that time forward the injunction was steadily employed by Federal and state courts, but it was not until the great railway strike of 1894 in Chicago that it was brought prominently before the country as a distinct political issue. In that strike, the Democratic governor, Mr. Altgeld, believing that the employers had fomented disorder for the purpose of invoking Federal intervention (as was afterward pretty conclusively shown), refused to employ the state militia speedily and effectively, contending that the presence of troops would only make matters worse. The postal authorities, influenced by a variety of motives, of which, it was alleged, a desire to break the strike was one, secured prompt Federal intervention on the part of President Cleveland and the use of Federal troops. Thus the labor unions were quickly checkmated.