Edward Snowden has just made that abundantly clear to the entire world.

Are you on the list?

Are you one of the millions of Americans that have been designated a threat to national security by the U.S. government?

Will you be subject to detention when martial law is imposed during a major national emergency?

Main Core is the code name of an American governmental database that is believed to have been in existence since the 1980s. It is believed that Main Core is a federal database containing personal and financial data of millions of United States citizens[clarification needed] believed to be threats to national security.

The data, which is believed to come from the NSA, FBI, CIA, and other sources,is collected and stored without warrants or court orders. The database's name derives from the fact that it contains "copies of the 'main core' or essence of each item of intelligence information on Americans produced by the FBI and the other agencies of the U.S. intelligence community".