i Register
In some senses, fbi is marked as US, British, humorous. Watch for register when choosing this word.
ADJ.
efficient, former, national, requested, turned
The former FBI director testified before Congress about the agency's recent investigations.
VERB + FBI
call, know, lied, wanted, works
The witness lied to the FBI about what she saw that night.
FBI + NOUN
agent, snitch
The FBI agent arrived at the crime scene early that morning to collect evidence.
PREP.
in, with
The suspect was arrested after the FBI worked in collaboration with local police departments.
ADV.
secretly
The FBI secretly monitored the suspect's communications for several months before making an arrest.