>Classes of FBI Records in the National Archives
https://www.archives.gov/research/investigations/fbi/classifications
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1 - Training Matters
2 - Neutrality Matters
3 - Overthrow or Destruction of the Government
7 - Kidnapping
9 - Extortion
15 - Theft from Interstate Shipment
17 - Fraud Against the Government – Veterans Administration
18 - May Act
19 - Censorship Matters
20 - Federal Grain Standards Act
22 -National Motor Vehicle Traffic Act
23 - Prohibition
25 - Selective Service Act
26 - Interstate Transportation of Stolen Motor Vehicle or Aircraft
27 - Patent Matters
28 - Copyright Matters
29 - Bank Fraud and Embezzlement
31 - White Slave Traffic Act
32 - Identification (Fingerprint Matters)
34 - Violation of Lacy Act
35 - Civil Service
36 - Mail Fraud
37 - False Claim Against the Government
38 - Application for Pardon to Restore Civil Rights
39 - Falsely Claiming Citizenship
40 - Passport and Visa Matters
41 - Explosives
42 - Deserters
43 - Illegal Wearing of Uniform or Decorations
44 - Civil Rights (Racial Violence or Discrimination)
45 - Crimes of the High Seas…