Kenneth Lay

From 9/11 Encyclopedia:

Enron Founder and Chairman Kenneth Lay worked in the Pentagon for the Nixon administration during the Vietnam War.

Lay is a close friend of George Bush, Sr. In fact, his Houston home in River Oaks is near the Tanglewood residence of the former President and CIA Director. Although there have been no published reports of Bush Sr. doing favors for Lay, three of the "Bush Boys" have used their father's name to get contracts for Enron. According to an article by Seymour Hersh in the New Yorker, Neil and Marvin Bush tried to influence government officials for an Enron bid to rebuild Shuaiba North power plant in Kuwait.
Ironically this power plant was destroyed in George Bush's Persian Gulf War. Enron abandoned the bid in 2000.

In 1988, then Texas governor George Bush Jr., telephoned Rodolfo Terragno, Argentina's Public Works Minister, to ask him to award Enron a contract to build a pipeline from Chile to Argentina. "He assumed that the fact he was the son of the president would exert influence. I felt pressured. It was not proper for him to make that kind of call," Terragno told The Nation.

Finally, when Carlos Menem, another Bush Sr. crony, became president of Argentina, Enron won the bid. Neil Bush, director of the failed Denver-based Silverado Savings and Loan, created a subsidiary of his oil company to conduct business in Argentina in 1987. Argentina finally got so fed up with the Bush Clan (->), they formally had a parliamentary investigation regarding their so-called "business dealings. 

Source: Etherzone/Uri Dowbenko (->). Uri Dowbenko is a free-lance writer and a frequent columnist for Ether Zone.
 Furthermore Dowbenko is Chairman and CEO of New Improved Entertainment.

Enron -- the smokin' cannon of 9/11 ?