The Committee on Foreign Investment in the United States (CFIUS)
http://www.fas.org/sgp/crs/natsec/RL33388.pdf
Discusses issues related to national security, transparency, and foreign investment relating to the work of the CFIUS since the Dubai World Ports 2006 effort to take over operation of 6 major U.S. ports. From the Congressional Research Service, posted by the Federation of American Scientists.