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Classification 100: Domestic Security

In 1936, President Roosevelt directed the Bureau to investigate organizations suspected of subversive activities such as communism and fascism. In 1939, Classification 100 was formally established when the FBI was designated by Presidential Directive as the "clearing house" for national defense and general domestic intelligence matters.

Between 1940 and 1970, the Bureau's activity in this area was almost exclusively limited to investigations of communist and Soviet individuals and organizations. For example, in 1944 the classification was restricted to cases bearing the character of internal security in which the accompanying symbol letter "C" for communist or "R" for Russian was attached. In the 1970s the Bureau expanded its investigations to include the "New Left" organizations, revolutionaries, and urban terrorists.

NARA online catalog descriptions of holdings for Classification 100: Domestic Security

Headquarters Files

Record GroupNARA IdentifierSeries Title
65566495Classification 100 (Domestic Security) Released Under The Nazi War Crimes and Japanese Imperial Government Disclosure Acts
656282555Classification 100 (Domestic Security) Headquarters Case Files

Field Office Files

Record GroupNARA IdentifierSeries Title
656039723Classification 100 (Domestic Security), Field Office Case Files - Albany, New York
655928164Classification 100 (Domestic Security), Field Office Case Files - Albuquerque, New Mexico
655928156Classification 100 (Domestic Security), Field Office Case Files - Alexandria, Virginia
655928162Classification 100 (Domestic Security), Field Office Case Files - Anchorage, Alaska
655956694Classification 100 (Domestic Security), Field Office Case Files - Atlanta, Georgia
656107071Classification 100 (Domestic Security), Field Office Case Files - Baltimore, Maryland
655928167Classification 100 (Domestic Security), Field Office Case Files - Birmingham, Alabama
656018768Classification 100 (Domestic Security), Field Office Case Files - Boston, Massachusetts
656039724Classification 100 (Domestic Security), Field Office Case Files - Buffalo, New York
655928188Classification 100 (Domestic Security), Field Office Case Files - Butte, Montana
656014799Classification 100 (Domestic Security), Field Office Case Files - Charlotte, North Carolina
655952498Classification 100 (Domestic Security), Field Office Case Files - Chicago, Illinois
655928189Classification 100 (Domestic Security), Field Office Case Files - Cincinnati, Ohio
656014803Classification 100 (Domestic Security), Field Office Case Files - Cleveland, Ohio
655940630Classification 100 (Domestic Security), Field Office Case Files - Columbia, South Carolina
656019402Classification 100 (Domestic Security), Field Office Case Files - Dallas, Texas
655949541Classification 100 (Domestic Security), Field Office Case Files - Denver, Colorado
656014831Classification 100 (Domestic Security), Field Office Case Files - Detroit, Michigan
656014848Classification 100 (Domestic Security), Field Office Case Files - El Paso, Texas
655956452Classification 100 (Domestic Security), Field Office Case Files - Honolulu, Hawaii
655942073Classification 100 (Domestic Security), Field Office Case Files - Houston, Texas
656039820Classification 100 (Domestic Security), Field Office Case Files - Indianapolis, Indiana
656036648Classification 100 (Domestic Security), Field Office Case Files - Jackson, Mississippi
656003554Classification 100 (Domestic Security), Field Office Case Files - Jacksonville, Florida
656039725Classification 100 (Domestic Security), Field Office Case Files - Kansas City, Missouri
656004076Classification 100 (Domestic Security), Field Office Case Files - Knoxville, Tennessee
655942522Classification 100 (Domestic Security), Field Office Case Files - Las Vegas, Nevada
656039726Classification 100 (Domestic Security), Field Office Case Files - Little Rock, Arkansas
656039816Classification 100 (Domestic Security), Field Office Case Files - Los Angeles, California
656039813Classification 100 (Domestic Security), Field Office Case Files - Louisville, Kentucky
655942571Classification 100 (Domestic Security), Field Office Case Files - Memphis, Tennessee
655942572Classification 100 (Domestic Security), Field Office Case Files - Miami, Florida
656057839Classification 100 (Domestic Security), Field Office Case Files - Milwaukee, Wisconsin
656039812Classification 100 (Domestic Security), Field Office Case Files - Minneapolis, Minnesota
656014804Classification 100 (Domestic Security), Field Office Case Files - Mobile, Alabama
656004077Classification 100 (Domestic Security), Field Office Case Files - New Haven, Connecticut
656233617Classification 100 (Domestic Security), Field Office Case Files - Newark, New Jersey
655956205Classification 100 (Domestic Security), Field Office Case Files - New Orleans, Louisiana
656233621Classification 100 (Domestic Security), Field Office Case Files - New York, New York
655962151Classification 100 (Domestic Security), Field Office Case Files - Norfolk, Virginia
655956691Classification 100 (Domestic Security), Field Office Case Files - Oklahoma City, Oklahoma
656014800Classification 100 (Domestic Security), Field Office Case Files - Omaha, Nebraska
656104740Classification 100 (Domestic Security), Field Office Case Files - Philadelphia, Pennsylvania
655956674Classification 100 (Domestic Security), Field Office Case Files - Phoenix, Arizona
656039814Classification 100 (Domestic Security), Field Office Case Files - Pittsburgh, Pennsylvania
655943368Classification 100 (Domestic Security), Field Office Case Files - Portland, Oregon
655956693Classification 100 (Domestic Security), Field Office Case Files - Richmond, Virginia
655956187Classification 100 (Domestic Security), Field Office Case Files - Sacramento, California
656019829Classification 100 (Domestic Security), Field Office Case Files - Salt Lake City, Utah
656039730Classification 100 (Domestic Security), Field Office Case Files - San Antonio, Texas
656057840Classification 100 (Domestic Security), Field Office Case Files - San Diego, California
656018770Classification 100 (Domestic Security), Field Office Case Files - San Francisco, California
656125944Classification 100 (Domestic Security), Field Office Case Files - San Juan, Puerto Rico
656036646Classification 100 (Domestic Security), Field Office Case Files - Savannah, Georgia
655956689Classification 100 (Domestic Security), Field Office Case Files - Seattle, Washington
655956206Classification 100 (Domestic Security), Field Office Case Files - Springfield, Illinois
656039789Classification 100 (Domestic Security), Field Office Case Files - St. Louis, Missouri
655956673Classification 100 (Domestic Security), Field Office Case Files - Tampa, Florida
656057845Classification 100 (Domestic Security), Field Office Case Files - Washington, D.C.

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