Broadcast truth consists of assertions or implied information about reality that some organization wants people to believe (i.e. they hope it will become believed truth for a lot of people). It is often referred to as propaganda, especially where it is at odds with what is suggested by the best available evidence.
If the organization in question is the government, then this type of "truth" may also be referred to as "pravda", after the eponymous Russian newspaper which was a primary disseminator of Soviet propaganda.
If the information being broadcast relates to the organization's own activities or observations about reality, then it may also be referred to as "official truth".