A brick out of the WAll was JFK use of the NATIONAL guard

The U.S. military expects to have 20,000 uniformed troops inside the United States by 2011 trained to help state and local officials respond to a nuclear terrorist attack or other domestic catastrophe, according to Pentagon officials. The long-planned shift in the DOD's role in homeland security was recently backed with funding and troop commitments after years of prodding by Congress and outside experts, defense analysts said. There are critics of the change, in the military and among civil liberties groups and libertarians who express concern that the new homeland emphasis threatens to strain the military and possibly undermine the Posse Comitatus Act, a 130-year-old federal law restricting the military's role in domestic law enforcement. http://www.washingtonpost.com/wp-dyn/content/article/2008/11/30/AR2008113002217_pf.html
Posse Comitatus Act of 1878 20 Stat. L., 145 June 18, 1878 CHAP. 263 - An act making appropriations for the support of the Army for the fiscal year ending June thirtieth, eighteen hundred and seventy-nine, and for other purposes. SEC. 15. From and after the passage of this act it shall not be lawful to employ any part of the Army of the United States, as a posse comitatus, or otherwise, for the purpose of executing the laws, except in such cases and under such circumstances as such employment of said force may be expressly authorized by the Constitution or by act of Congress; and no money appropriated by this act shall be used to pay any of the expenses incurred in the employment of any troops in violation of this section And any person willfully violating the provisions of this section shall be deemed guilty of a misdemeanor and on conviction thereof shall be punished by fine not exceeding ten thousand dollars or imprisonment not exceeding two years or by both such fine and imprisonment. http://www.dojgov.net/posse_comitatus_act.htm ... http://law.wustl.edu/WULQ/75-2/752-10.html