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Then what is the FSB?

Huh? I didn't ask about the FSB (the first initialism). I asked about FSM (the last).

OOps sorry a bit tired and jetlagged.

For FSM the best I can do is the Flying Spaghetti Monster, nothing else here makes sense: https://en.wikipedia.org/wiki/FSM

That is the FSB (or (ФСБ). FSM isn't the acronym or a transliteration of any known national intelligence service.

FSB - Federal Security Service, Russia

MSS - Ministry of State Security, China

DGSE - General Directorate for External Security, France

FSM - Federated States of Micronesia National Police would be my best guess. They do dignitary protection and counter-narcotics, so I would assume they have at least some intelligence function.

Given that Micronesia has a population of 100k, I wouldn't worry too much about their secret service.

I presume OP meant FSM as in Flying Spaghetti Monster as a stand-in for any organization that might wish to spy on you with its noodly appendages.