Murrow may have caved to political pressure.
At the threshold of the McCarthy era, William L. Shirer was abruptly fired from his highly rated CBS radio broadcast by the sponsor, a shaving-cream manufacturer, who pronounced him to be too liberal. To Shirers shock and grief, the decision was endorsed by CBS as well as Shirers boss and former comrade-in-arms as a war correspondent in World War II, Edward R. Murrow. The firing destroyed my career in broadcasting, Shirer writes, and almost destroyed me.
The blacklisting of Bill Shirer--and his rebirth as a popular historian and the author of Rise and Fall of the Third Reich--is at the heart of A Natives Return, the third volume of Shirers memoirs, 20th Century Journey. Now in his mid-80s, Shirers valedictory is bittersweet, and nothing captures his sense of disappointment in the downward spiral of history more poignantly than the Murrow incident.
Shirer excoriates the executives of the American media--including the networks, the advertising agencies, the sponsoring corporations--for surrendering to McCarthyism and making it work. They were the shabby cowards, he writes. If just one of them had shown a little courage and decency and said he was going to hire people on their merits and not on whether they were in Red Channels , the blacklists would have faded away. But none dared. Not one.
Murrow is not the only man whom Shirer justifiably sees as a betrayer. Shirer recalls that his own attorney, Morris Ernst, one of the foremost champions of civil liberties in the country, refused to file a libel action on Shirers behalf against Red Channels. (I see no valid basis, Ernst advised, for letting you spend your money on a libel suit.) Much later, as Shirer explains, it was revealed that Ernst had been a secret but fawning admirer of J. Edgar Hoover who shared private correspondence--and actually screened prospective cases and clients--with the FBI.
https://www.latimes.com/archives/la-xpm-1990-01-17-vw-17-story.html