Ah yes, the US government in the '50s was known for its cool headedness around soviet propoganda. The government certainly never did anything objectionable or concerning when given the ability to coerce those with suspected antigovernment sentiment.

The red scares and blacklistings and HUAC were just my imaginings.

Please cite examples of American press censoring content of other American journals and institutions based on a threat of “misinformation”.

Just one will do.

At this point I'm confused. I don't think that private companies censored other conpanies at all, even today, hence there is no need for the government to intervene. Further, government intervention in the media does end badly, so should be avoided.

If your asking if a news group has ever refused to run a story due to dubious sources, yes. That happens all the time and has happened as long as there has been journalism.

Nice that you had to parenthesize it, because both major parties involved in the Cold War were "noted power(s) with excellent propaganda techniques".

No one ever jammed Radio Moscow.