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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
65Classification 100 (Domestic Security) Released Under The Nazi War Crimes and Japanese Imperial Government Disclosure Acts
65Classification 100 (Domestic Security) Headquarters Case Files

Field Office Files

Record GroupNARA IdentifierSeries Title
65Classification 100 (Domestic Security), Field Office Case Files - Albany, New York
65Classification 100 (Domestic Security), Field Office Case Files - Albuquerque, New Mexico
65Classification 100 (Domestic Security), Field Office Case Files - Alexandria, Virginia
65Classification 100 (Domestic Security), Field Office Case Files - Anchorage, Alaska
65Classification 100 (Domestic Security), Field Office Case Files - Atlanta, Georgia
65Classification 100 (Domestic Security), Field Office Case Files - Baltimore, Maryland
65Classification 100 (Domestic Security), Field Office Case Files - Birmingham, Alabama
65Classification 100 (Domestic Security), Field Office Case Files - Boston, Massachusetts
65Classification 100 (Domestic Security), Field Office Case Files - Buffalo, New York
65Classification 100 (Domestic Security), Field Office Case Files - Butte, Montana
65Classification 100 (Domestic Security), Field Office Case Files - Charlotte, North Carolina
65Classification 100 (Domestic Security), Field Office Case Files - Chicago, Illinois
65Classification 100 (Domestic Security), Field Office Case Files - Cincinnati, Ohio
65Classification 100 (Domestic Security), Field Office Case Files - Cleveland, Ohio
65Classification 100 (Domestic Security), Field Office Case Files - Columbia, South Carolina
65Classification 100 (Domestic Security), Field Office Case Files - Dallas, Texas
65Classification 100 (Domestic Security), Field Office Case Files - Denver, Colorado
65Classification 100 (Domestic Security), Field Office Case Files - Detroit, Michigan
65Classification 100 (Domestic Security), Field Office Case Files - El Paso, Texas
65Classification 100 (Domestic Security), Field Office Case Files - Honolulu, Hawaii
65Classification 100 (Domestic Security), Field Office Case Files - Houston, Texas
65Classification 100 (Domestic Security), Field Office Case Files - Indianapolis, Indiana
65Classification 100 (Domestic Security), Field Office Case Files - Jackson, Mississippi
65Classification 100 (Domestic Security), Field Office Case Files - Jacksonville, Florida
65Classification 100 (Domestic Security), Field Office Case Files - Kansas City, Missouri
65Classification 100 (Domestic Security), Field Office Case Files - Knoxville, Tennessee
65Classification 100 (Domestic Security), Field Office Case Files - Las Vegas, Nevada
65Classification 100 (Domestic Security), Field Office Case Files - Little Rock, Arkansas
65Classification 100 (Domestic Security), Field Office Case Files - Los Angeles, California
65Classification 100 (Domestic Security), Field Office Case Files - Louisville, Kentucky
65Classification 100 (Domestic Security), Field Office Case Files - Memphis, Tennessee
65Classification 100 (Domestic Security), Field Office Case Files - Miami, Florida
65Classification 100 (Domestic Security), Field Office Case Files - Milwaukee, Wisconsin
65Classification 100 (Domestic Security), Field Office Case Files - Minneapolis, Minnesota
65Classification 100 (Domestic Security), Field Office Case Files - Mobile, Alabama
65Classification 100 (Domestic Security), Field Office Case Files - New Haven, Connecticut
65Classification 100 (Domestic Security), Field Office Case Files - Newark, New Jersey
65Classification 100 (Domestic Security), Field Office Case Files - New Orleans, Louisiana
65Classification 100 (Domestic Security), Field Office Case Files - New York, New York
65Classification 100 (Domestic Security), Field Office Case Files - Norfolk, Virginia
65Classification 100 (Domestic Security), Field Office Case Files - Oklahoma City, Oklahoma
65Classification 100 (Domestic Security), Field Office Case Files - Omaha, Nebraska
65Classification 100 (Domestic Security), Field Office Case Files - Philadelphia, Pennsylvania
65Classification 100 (Domestic Security), Field Office Case Files - Phoenix, Arizona
65Classification 100 (Domestic Security), Field Office Case Files - Pittsburgh, Pennsylvania
65Classification 100 (Domestic Security), Field Office Case Files - Portland, Oregon
65Classification 100 (Domestic Security), Field Office Case Files - Richmond, Virginia
65Classification 100 (Domestic Security), Field Office Case Files - Sacramento, California
65Classification 100 (Domestic Security), Field Office Case Files - Salt Lake City, Utah
65Classification 100 (Domestic Security), Field Office Case Files - San Antonio, Texas
65Classification 100 (Domestic Security), Field Office Case Files - San Diego, California
65Classification 100 (Domestic Security), Field Office Case Files - San Francisco, California
65Classification 100 (Domestic Security), Field Office Case Files - San Juan, Puerto Rico
65Classification 100 (Domestic Security), Field Office Case Files - Savannah, Georgia
65Classification 100 (Domestic Security), Field Office Case Files - Seattle, Washington
65Classification 100 (Domestic Security), Field Office Case Files - Springfield, Illinois
65Classification 100 (Domestic Security), Field Office Case Files - St. Louis, Missouri
65Classification 100 (Domestic Security), Field Office Case Files - Tampa, Florida
65Classification 100 (Domestic Security), Field Office Case Files - Washington, D.C.

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