The history-making felony conviction of former President Donald J. Trump has raised some historic questions for the House’s rules of decorum, which have existed for centuries but can be bent to the will of whichever party controls the majority-driven chamber.

The Republicans who now hold the majority have used those rules to impose what is essentially a gag order against talking about Mr. Trump’s hush-money payments to a porn actress or about the fact that he is a felon at all, notwithstanding that those assertions are no longer merely allegations but the basis of a jury’s guilty verdict. Doing so, they have declared, is a violation of House rules.

In short, perhaps the only place in the United States where people are barred from talking freely about Mr. Trump’s crimes is the floor of what is often referred to as “the people’s House,” where Republicans have gone so far as to erase one such mention from the official record.