The FBI works within the USA. It would be the CIA that would does meddling in other countries' elections. Seems you have been spending too much time watching cartoons.
Is the US perpetrating military-grade psi ops against other country's electorates? Not trying to be glib; if you have evidence for that I would be all eyes.
Yes. You need to research history esp. in Latin America. I liked reading the book: “Confessions of an Economic Hitman”. Also Lookup Operation Ajax and how the CIA overthrew the democratically elected Mossaddegh in Iran. A Roosevelt organized that one.... I think Wikipedia has documented 81 attempts at US intervention in foreign elections lol.
Whether or not you believe it or not, the same statements could be said about current election. Will be obvious if you have high levels of self-awareness.
The pikachu meme seems more than appropriate here.