During the critical 100 days of Roosevelt's presidency in spring 1933, Long was generally a strong supporter of the New Deal, but differed with the president on patronage.
Roosevelt wanted control of the patronage, and Long wanted to control it for his state.
The two men publicly split in late 1933.
Long mocked Roosevelt's patrician background, calling him "Prince Franklin, Knight of the Nourmahal," a reference to the yacht of Roosevelt's billionaire friend Vincent Astor.
Aware that Roosevelt had no intention to radically redistribute the country's wealth, Long became one of the few national politicians to oppose Roosevelt's New Deal policies from the left.
He considered them inadequate in the face of the escalating economic crisis.
Long still sometimes supported Roosevelt's programs in the Senate, explaining: "Whenever this administration has gone to the left I have voted with it, and whenever it has gone to the right I have voted against it."

Long opposed the National Recovery Act, denouncing it as a sellout to big business.
On the Senate floor, he attacked the bill as having "every fault of socialism" yet not "one of its virtues."
He claimed, correctly, that its wage and price codes would be created by, and in the favor of, industrialists.
In an attempt to prevent its passage, Long held a lone filibuster, speaking for 15 hours and 30 minutes, the second longest filibuster at the time.
His attempts were in vain, and the act established the National Recovery Administration (NRA), which Long quickly nicknamed "Nuts Running America".
He also criticized Social Security, calling it inadequate and expressing his concerns that states would administer it in a way discriminatory to blacks.
In 1933, he was a leader of a three-week Senate filibuster against the Glass banking bill for favoring the interests of national banks over state banks.
He later supported the Glass–Steagall Act, after provisions were made to extend government deposit insurance to state banks as well as national banks.

Roosevelt considered Long a radical demagogue.
The president told economic advisor Rexford Tugwell that Long, along with General Douglas MacArthur, "was one of the two most dangerous men in America."
In June 1933, Long visited the White House to meet President Roosevelt, but the meeting was a disaster: Long was flagrantly disrespectful, refusing to take off his straw hat and addressing Roosevelt as "Frank", instead of the normal "Mr. President".

Shortly thereafter, in June 1933, in an effort to undermine Long's political dominance, Roosevelt cut him out of consultation on the distribution of federal funds or patronage in Louisiana and placed Long's opponents in charge of federal programs in the state.
Roosevelt also supported a Senate inquiry into the election of Long ally John H. Overton to the Senate in 1932.
The Long machine was charged with election fraud and voter intimidation, but the inquiry came up empty, and Overton was seated.
 To discredit Long and damage his support base, Roosevelt had Long's finances investigated by the Internal Revenue Service in 1934.
Although they failed to link Long to any illegality, some of his lieutenants were charged with income tax evasion.
Only one had been convicted by the time of Long's death.
Roosevelt's son would later note that in this instance, his father "may have been the originator of the concept of employing the IRS as a weapon of political retribution".
During the critical 100 days of Roosevelt's presidency in spring 1933, Long was generally a strong supporter of the New Deal, but differed with the president on patronage. Roosevelt wanted control of the patronage, and Long wanted to control it for his state. The two men publicly split in late 1933. Long mocked Roosevelt's patrician background, calling him "Prince Franklin, Knight of the Nourmahal," a reference to the yacht of Roosevelt's billionaire friend Vincent Astor. Aware that Roosevelt had no intention to radically redistribute the country's wealth, Long became one of the few national politicians to oppose Roosevelt's New Deal policies from the left. He considered them inadequate in the face of the escalating economic crisis. Long still sometimes supported Roosevelt's programs in the Senate, explaining: "Whenever this administration has gone to the left I have voted with it, and whenever it has gone to the right I have voted against it."
Long opposed the National Recovery Act, denouncing it as a sellout to big business. On the Senate floor, he attacked the bill as having "every fault of socialism" yet not "one of its virtues." He claimed, correctly, that its wage and price codes would be created by, and in the favor of, industrialists. In an attempt to prevent its passage, Long held a lone filibuster, speaking for 15 hours and 30 minutes, the second longest filibuster at the time. His attempts were in vain, and the act established the National Recovery Administration (NRA), which Long quickly nicknamed "Nuts Running America". He also criticized Social Security, calling it inadequate and expressing his concerns that states would administer it in a way discriminatory to blacks. In 1933, he was a leader of a three-week Senate filibuster against the Glass banking bill for favoring the interests of national banks over state banks. He later supported the Glass–Steagall Act, after provisions were made to extend government deposit insurance to state banks as well as national banks.
Roosevelt considered Long a radical demagogue. The president told economic advisor Rexford Tugwell that Long, along with General Douglas MacArthur, "was one of the two most dangerous men in America." In June 1933, Long visited the White House to meet President Roosevelt, but the meeting was a disaster: Long was flagrantly disrespectful, refusing to take off his straw hat and addressing Roosevelt as "Frank", instead of the normal "Mr. President".
Shortly thereafter, in June 1933, in an effort to undermine Long's political dominance, Roosevelt cut him out of consultation on the distribution of federal funds or patronage in Louisiana and placed Long's opponents in charge of federal programs in the state. Roosevelt also supported a Senate inquiry into the election of Long ally John H. Overton to the Senate in 1932. The Long machine was charged with election fraud and voter intimidation, but the inquiry came up empty, and Overton was seated.  To discredit Long and damage his support base, Roosevelt had Long's finances investigated by the Internal Revenue Service in 1934. Although they failed to link Long to any illegality, some of his lieutenants were charged with income tax evasion. Only one had been convicted by the time of Long's death. Roosevelt's son would later note that in this instance, his father "may have been the originator of the concept of employing the IRS as a weapon of political retribution".
Huey Long