Hoover appointed three justices of the Supreme Court of the United States. George W. Norris, the Chairman of the Senate Judiciary Committee, insisted that Hoover nominate a progressive judge to succeed Holmes. Hoover urged voters to hold to the 'foundations of experience,' rejecting the notion that government interventionism could save the country from the Depression. In his campaign trips around the country, Hoover was faced with perhaps the most hostile crowds of any sitting president. Besides having his train and motorcades pelted with eggs and rotten fruit, he was often heckled while speaking, and on several occasions, the Secret Service halted attempts to kill Hoover by disgruntled citizens, including capturing one man nearing Hoover carrying sticks of dynamite, and another already having removed several spikes from the rails in front of the president's train.The Democrats attacked Hoover as the cause of the Great Depression, and for being indifferent to the suffering of millions.