That's not something you fine or lock someone up for.
So what do you think Blanchard Mosaka and Marchouse went to do at Makala prison, you think they went shopping or it's because Koffi paid police to have them locked up?
Yes, in developed nations, someone cannot be locked up but they may be fined if the person defamed ensures that the law takes its course and they seek damages.
I know you're in the USA so here according to your laws there, this is what it's called
"Defamation-
Any intentional false communication, either written or spoken, that harms a person's reputation; decreases the respect, regard, or confidence in which a person is held; or induces disparaging, hostile, or disagreeable opinions or feelings against a person.
Defamation may be a criminal or civil charge. It encompasses both written statements, known as libel, and spoken statements, called slander.
The probability that a plaintiff will recover damages in a defamation suit depends largely on whether the plaintiff is a public or private figure in the eyes of the law."