In communication, content filters are known as

Content filters in communication are the gatekeepers who decide what messages get printed, broadcast or produced.

Gatekeepers work within mass media, selectively passing on or holding back information before it reaches the audience.

Monitors merely observe or oversee and do not perform the selective screening that content filtering means.

Foremen supervise workers in a workplace and carry no meaning tied to filtering communication content.

Content guards is not an accepted term in communication theory for those who screen messages.

Robert Katz described gatekeepers as intermediaries who shape flow through their selective sharing of information.