This was the sort of censorship that the Soviet leadership excelled in - now we're seeing it reapeated in the US.
John Bolton Dodges Question; Insults Anti-War Veteran
"I was in the audience for the taping. Bolton was booed when taking the stage, at which point one of the show's producers hissed at us and said something about "allowing a fair debate". In spite of that, he was then booed overwhelmingly after giving his back-handed insult of an answer to the young vet at the microphone. You can hear a bit of her hissing and shushing again during the clip when the boos start up." - Via r/Libertarian
Note, this isn't the first time FOX was caught editing out boos and replacing it with applause, one year ago FOX was caught editing footage from CPAC where Ron Paul won the straw poll and was cheered, they edited the cheers out and replaced them with boos! They later said it was a "mistake" and they just so happened to have edited in footage from the previous year.