Meta terminology
LEI
Law Enforcement Investigations
Internal investigations team handling law-enforcement liaison and the strategic network disruptions through which sextortion accounts were actually taken down. The source document credits it, with LEAP and i3, with "high-precision Sigma rules to auto-disable ~262K sextortion accounts based on behaviors & profile picture reuse", in the same workstream that "reported 88 users to NCMEC, & escalated 25 Snapchat usernames to Snap for redress".
Source
Internal documentFinancial Sextortion in Instagram Direct