As the scope of the Presidency expanded during the 20th century, the Secret Service found the problems of protection becoming more numerous. In 1906, for the first time in history, a President traveled outside the United States while in office. When Theodore Roosevelt visited Panama in that year, he was accompanied and protected by Secret Service men.41 In 1918-19 Woodrow Wilson broadened the precedent of Presidential foreign travel when he traveled to Europe with a Secret Service escort of 10 men to attend the Versailles Peace Conference.42

The attempt on the life of President-elect Franklin D. Roosevelt in 1933 further demonstrated the broad scope and complexity of the protection problems facing the Secret Service. Giuseppe Zangara was a bricklayer and stonemason with a professed hatred of capitalists and Presidents. He seemed to be obsessed with the desire to kill a President. After his arrest he confessed that he had first planned to go to Washington to kill President Herbert Hoover, but as the cold climate of the North was bad for his stomach trouble, he was loath to leave Miami, where he was staying. When he read in the paper that President-elect Roosevelt would be in Miami, he resolved to kill him.43

On the night of February 15, 1933, at, a political rally in Miami's Bayfront Park, the President-elect sat on the top of the rear seat of his automobile with a small microphone in his hand as he made a short informal talk. Fortunately for him, however, he slid down into the seat just before Zangara could get near enough to take aim. The assassin's arm may have been jogged just as he shot; the five rounds he directed at Roosevelt went awry. However, he mortally wounded Mayor Anton Cermak, of Chicago, and hit four other persons; the President-elect, by a miracle, escaped. Zangara, of course, never had any chance of escaping.44

Zangara was electrocuted on March 20, 1933, only 33 days after his attempt on Roosevelt. No evidence of accomplices or conspiracy came to light, but there was some sensational newspaper speculation, wholly undocumented, that Zangara may have been hired by Chicago gangsters to kill Cermak.45
The force provided since the Civil War by the Washington Metropolitan Police for the protection of the White House had grown to 54 men by 1922.46 In that year Congress enacted legislation creating the White House Police Force as a separate organization under the direct control of the President.47 This force was actually supervised by the President's military aide until 1930, when Congress placed supervision under the Chief of the Secret Service.48 Although Congress transferred control and supervision of the force to the Secretary of the Treasury in 1962,49 the Secretary delegated supervision to the Chief of the Secret Service.50

The White House detail of the Secret Service grew in size slowly from the original 2 men assigned in 1902. In 1914 it still numbered only 5, but during World War I it was increased to 10 men. Additional men were added when the President traveled. After the