FDR was warned before the attack on Pearl Harbor by the Japanese

[edu]

This article claims that President Franklin Roosevelt had the intelligence information about an  upcoming Japanese attack but the author of the article feels it wasn't a conspiracy to leave the base unprepared for the attack, but rather just poor judgement.
http://www.telegraph.co.uk/news/worldnews/northamerica/usa/8932197/Pearl-Harbour-memo-shows-US-warned-of-Japanese-attack.html

Others do lean in the direction of a conspiracy
http://www.thenewamerican.com/culture/history/item/4740-pearl-harbor-hawaii-was-surprised-fdr-was-not

One of the most important elements in America's foreknowledge of Japan's intentions was our government's success in cracking Japan's secret diplomatic code known as "Purple." Tokyo used it to communicate to its embassies and consulates, including those in Washington and Hawaii. The code was so complex that it was enciphered and deciphered by machine. A talented group of American cryptoanalysts broke the code in 1940 and devised a facsimile of the Japanese machine. These, utilized by the intelligence sections of both the War and Navy departments, swiftly revealed Japan's diplomatic messages. The deciphered texts were nicknamed "Magic."

Copies of Magic were always promptly delivered in locked pouches to President Roosevelt, and the secretaries of State, War, and Navy. They also went to Army Chief of Staff General George Marshall and to the Chief of Naval Operations, Admiral Harold Stark. However, although three Purple decoding machines were allotted to Britain, none was sent to Pearl Harbor. Intercepts of ciphered messages radioed between Tokyo and its Honolulu consulate had to be forwarded to Washington for decrypting. Thus Kimmel and Short, the Hawaiian commanders, were at the mercy of Washington for feedback. A request for their own decoding machine was rebuffed on the grounds that diplomatic traffic was of insufficient interest to soldiers.

How untrue that was! On October 9, 1941, the War Department decoded a Tokyo-to-Honolulu dispatch instructing the Consul General to divide Pearl Harbor into five specified areas and to report the exact locations of American ships therein.

There is nothing unusual about spies watching ship movements — but reporting precise whereabouts of ships in dock has only one implication. Charles Willoughby, Douglas MacArthur's chief of intelligence, later wrote that the "reports were on a grid system of the inner harbor with coordinate locations of American men of war ... coordinate grid is the classical method for pinpoint target designation; our battleships had suddenly become targets." This information was never sent to Kimmel or Short.

Additional intercepts were decoded by Washington, all within one day of their original transmission:

However, whatever answer you give to the question how much responsibility did FDR have for the success of the Japanese attack, I will bring up one unpleasant Truth about the attack.

Pearl Harbor was great for the Jewish people, because it brought the USA into the war against the Nazis.
As far as the USA is concerned, spiritually and economically World War II was good for the country. Probably in the long run, the USA's security increased by going to war at that time, rather than letting Hitler get stronger.

[Binyamin Yisrael]

King Hussein also warned Golda Meir before The Yom Kippur War that the Egyptian and Syrian Arab Muslim Nazis were going to attack Israel and we know how that worked out.

[syyuge]

It happens! Warnings were also given for WTC just 20 hours before it happened and for five cornered star just 72 hours before it happened. Perhaps then they were considered eccentrically wobbling and not considered till it actually happened. G_d is ultimate.