The Selective Service Act of 1917 or Selective Draft Act authorized the United States federal government to raise a national army for service in World War I through conscription. It was envisioned in December 1916 and brought to President Woodrow Wilson's attention shortly after the break in relations with Germany in February 1917. The Act itself was drafted by then-Captain Hugh S. Johnson after the United States entered World War I by declaring war on Germany. The Act was canceled with the end of the war on November 11, 1918. The Act was upheld as constitutional by the United States Supreme Court in 1918.

Hugh Samuel Johnson was a United States Army officer, businessman, speech writer, government official and newspaper columnist. He was a member of the Brain Trust of Franklin D. Roosevelt from 1932 to 1934. He wrote numerous speeches for FDR and helped plan the New Deal. Appointed head of the National Recovery Administration (NRA) in 1933, he was highly energetic in his "blue eagle" campaign to reorganize American business to reduce competition and raise wages and prices. Schlesinger (1958) and Ohl (1985) conclude that he was an excellent organizer, but that he was also domineering, abusive, outspoken, and unable to work harmoniously with his peers. He lost control of the NRA in August 1934.