4. Here's where it gets interesting. The file documents the service of a grand jury subpoena to unknown subjects by the "SA," or "special agent." It reveals some rare details about the FBI's collection of phone data from targeted numbers as it pertains to the alleged threatening phone calls. The document refers to a "legal instrument" authorizing the FBI to collect such information from various phone carriers. It likely means that the FBI obtained all the phone numbers that called the inn within a specific date range in an effort to locate the ALF member. The file also outlines the two-step plan that the FBI used to prevent "over-collection," though the "legal instrument" set to safeguard against the over-collection is not specified. However, the details of what happened after "no overproduction" was ensured remain redacted.