What best describes the gag rule?

The gag rule refers to a policy or regulation that restricts or prohibits certain types of speech or discourse, often in legislative or organizational contexts. Historically, it has been associated with efforts to limit discussion on controversial topics, such as abortion, particularly in the U.S. Congress where it was used to silence debates on specific issues. In broader contexts, gag rules can also apply to non-disclosure agreements or policies that prevent individuals from speaking freely about certain matters.