The radical structure, however, was still powerfully supported from without. Relations between the Federal Government and the state governments in the South were close, and the policy at Washington was frequently determined by conditions in the South. President Grant, though at first considerate, was usually consistently radical in his Southern policy. This attitude is difficult to explain except by saying that Grant fell under the control of radical advisers after his break with Johnson, that his military instincts were offended by opposition in the South which his advisers told him was rebellious, and that he was impressed by the need of holding the Southern radical vote against the inroads of the Democrats. After about 1869 Grant never really understood the conditions in the South. He was content to control by means of Federal troops and thousands of deputy marshals. For this policy the Ku Klux activities gave sufficient excuse for a time, and the continued story of "rebel outrages" was always available to justify a call for soldiers or deputies. The enforcement legislation gave the color of law to any interference which was deemed necessary. Federal troops served other ends than the mere preservation of order and the support of the radical state governments. They were used on occasion to decide between opposing factions and to oust conservatives who had forced their way into office. The army officers purged the Legislature of Georgia in 1870, that of Alabama in 1872, and that of Louisiana in 1875. In 1875 the city government of Vicksburg and the state government of Louisiana were overturned by the whites, but General Sheridan at once intervened to put back the negroes and carpetbaggers. He suggested to President Grant that the conservatives be declared "banditti" and he would make himself responsible for the rest. As soon as a State showed signs of going over to the Democrats or an important election was lost by the radicals, one House or the other of Congress in many instances sent an investigation committee to ascertain the reasons. The Committees on the Condition of the South or on the Late Insurrectionary States were nearly always ready with reports to establish the necessity of intervention. Besides the army there was in every State a powerful group of Federal officials who formed a "ring" for the direction of all good radicals. These marshals, deputies, postmasters, district attorneys, and customhouse officials were in close touch with Washington and frequently dictated nominations and platforms. At New Orleans the officials acted as a committee on credentials and held all the state conventions under their control in the customhouse.