rumour control
/ˈruːmə kənˌtrəʊl/(US rumor control) originally and chiefly US
noun
1The action or practice of trying to limit the spread of rumours; specifically the official or organized provision of information to counter or correct rumours which might cause unrest or confusion; a service which provides such information.
2 Humorous (originally Military ). A notional (official) source of rumours; the rumour mill.
Origin
1940s; earliest use found in Public Opinion Quarterly. From rumour + control.