From a story in the L.A. Times (get an ID and password from bugmenot.com):
"This letter is for yourself alone," [reads a letter written by Upton Sinclair to his attorney on Sept. 29, 1929]. "Stick it away in your safe, and some time in the far distant future the world may know the real truth about the matter. I am here trying to make plain my own part in the story."It surpriseth me not. Sinclair was a role model for today's Left-leaning media. What other lies did Sinclair tell in order to advance the "progressive" (i.e., socialist) cause?
The story was "Boston," Sinclair's 1920s novelized condemnation of the trial and execution of Nicola Sacco and Bartolomeo Vanzetti, Italian immigrants accused of killing two men in the robbery of a Massachusetts shoe factory.
Prosecutors characterized the anarchists as ruthless killers who had used the money to bankroll antigovernment bombings and deserved to die. Sinclair thought the pair were innocent and being railroaded because of their political views.
Soon Sinclair would learn something that filled him with doubt. During his research for "Boston," Sinclair met with Fred Moore, the men's attorney, in a Denver motel room. Moore "sent me into a panic," Sinclair wrote in the typed letter that Hegness found at the auction a decade ago.
"Alone in a hotel room with Fred, I begged him to tell me the full truth," Sinclair wrote. " … He then told me that the men were guilty, and he told me in every detail how he had framed a set of alibis for them." . . .
Upton Beall Sinclair was a giant of the nation's Progressive Era, a crusading writer and socialist who championed the downtrodden and persecuted. President Theodore Roosevelt, who pushed through the nation's first food-purity laws in response to "The Jungle," coined the name for Sinclair's craft: muckraker. . . .
"I faced the most difficult ethical problem of my life at that point," [Sinclair] wrote to his attorney. "I had come to Boston with the announcement that I was going to write the truth about the case."
Other letters tucked away in the Indiana archive illuminate why one of America's most strident truth tellers kept his reservations to himself. . . .
He also worried that revealing what he had been told would cost him readers. "It is much better copy as a naïve defense of Sacco and Vanzetti because this is what all my foreign readers expect, and they are 90% of my public," he wrote to Minor.
UPDATE: This is from a post by Eugene Volokh at The Volokh Conspiracy:
The ACLU's founding director and likely most influential official, Roger Baldwin, had long been an admitted supporter of communism as an economic system, and on balance an apologist for the Soviet Union. Though he criticized the Soviets at times, he had also praised the USSR as on balance a haven for liberty. His true break with the Soviets (which ultimately brought him around to pretty vociferous anti-Communism) came not with Stalin's ascent, not with the Ukrainian famine, not with the Terror and the show trials — he defended the Soviets even after that — but only in 1939, with the Molotov-Ribbentrop pact.
On top of that, Baldwin was on the record as having said that his commitment to civil liberties for supposed reactionaries was sheerly instrumental, just a tool for advancing the cause of communism. His struggle for free speech, he said, was just incidental to the class struggle, a useful tactic for furthering communist goals. When the working class took over, the resulting regime should be supported by any means necessary, including dictatorship. Dictatorship and suppression of civil liberties would be necessary to get to a socialist society, so such suppression is justified. That was the position of the founding director of the ACLU.