| Abbreviation | Definition |
|---|---|
| LES | Leave and Earnings Statement |
| LGE | Loyalty of Government Employees |
| LHM | LetterHead Memo |
| LLD | Live Letter Drop |
| LMRA | Labor Management Relations Act 1947 |
| LNU | Last Name Unknown |
| LOA | Leader Of the Assassins |
| LR | Little Rock Field Office |
| LRA | Long Range Assignmemt |
| LRC | Last Relevant Communication |
| LS | Louisville Field Office |
| LV | Las Vegas Field Office |
| MAOP | Manual of Administrative Operations and Procedures |
| MAPP | MAnual of Policies and Procedures |
| matsburd | maybea tit shouldbrighten up your day |
| MC | Mexico City |
| MCTF | Major Crime Task Force |
| ME | Memphis Field Office |
| MID | Military Intelligence Division |
| MIOG | FBI Manual of Investigative Operations and Guidelines |