And it surely didn't hurt to have Homer Stille Cummings as A.G....
FDR's New Deal "hit man".
Homer really didn't much like guns -
or people who stood in his way...
His proposed gun laws were draconian indeed, but only what became the NFA made it through the legislative process
"Cummings transformed the Department of Justice. He established uniform rules of practice and procedure in federal courts. Appalled by the crime waves of the Prohibition era, he secured the passage of twelve laws that buttressed the "Lindbergh law" on kidnapping, made bank robbery a federal crime, cracked down on interstate transportation of stolen property, and extended federal regulations over firearms. He strengthened the Federal Bureau of Investigation, called a national crime conference, supported the establishment of Alcatraz as a model prison for hardened offenders, and reorganized the internal administration of the department. In 1937 Cummings published "We Can Prevent Crime, and, with Carl McFarlan, an assistant attorney general, "Federal Justice," a departmental history, "The Selected Papers of Homer Cummings" (1939), edited by Carl B. Swisher, supplemented the history.
Cummings's path as protector of New Deal programs was thorny. During his first week as attorney general, he advised Roosevelt that the Trading with the Enemy Act of 1917 permitted the president to close banks and regulate gold hoarding and export. Cummings personally argued the right of the government to ban gold payments before the Supreme court and won the "gold clause" cases. The department's defense of subsequent administration measures was notoriously unsuccessful, however. During 1935-1936, the Court, frequently by 5 to 4 votes, overthrew eight key statutes, including the National Industrial Recovery Act (NIRA) and the Agricultural Adjustment Act (AAA).
The obtuseness of the conservative Court majority rankled. Cummings was eager to expand the judiciary and was outraged by the proliferation of lawsuits and injunctions against the government. After the election of 1936, Roosevelt instructed him to draft legislation for court reform. Neither wished to alter the Constitution. Both were attracted by an idea proposed earlier by conservative Justice James McReynolds, to add a judge for every judge who refused to retire at age seventy at full pay. Such a measure might give the president the opportunity to appoint fifty new judges, including six to the Supreme Court. Roosevelt launched the proposal, prepared secretly by Cummings, on Feb. 5, 1937. The uproar that confronted the "court-packing plan" is well known. After 168 days the Senate killed the bill by returning it to committee."
http://www.kichline.com/carrie/ICFA/homer.htm