Thanks to Judith for pointing this out. The SEC publishes a list of companies that do business with state sponsors of terror .Of course, our so-called friends the Saudis, oil tick sponsors of Wahhabi Islam and Islamist terror, aren't considered a state sponsor of terror by our government, so companies that do business with them aren't listed. But this list is useful anyway. You can make a difference with your investment decisions and purchase choices - for maximum impact let the companies know why you are taking your business elsewhere.
Companies that do business with Iran
Companies that do business with Sudan
Companies that do business with Syria
Companies that do business with North Korea
UPDATE: Well, look at our spineless political class: Congressional pressure forced SEC to remove the above lists. SEC withdraws list linking companies to terrorismWithin the last week, both the chairman and the ranking Republican member of the House Financial Services Committee had written to the SEC criticizing the list. The chairman, Barney Frank, Democrat of Massachusetts, called the list "unfair and perhaps counterproductive." He said some companies "apparently have investments that are so negligible they could not be considered material either to investors or the economy of the terrorist financing state." The ranking Republican of the committee, Spencer Bachus of Alabama, said "this initiative appears to have been ill-conceived and poorly implemented."