https://quillette.com/2020/08/08/george-orwell-and-the-struggle-against-inevitable-bias/
In the bleak post-war Britain of October 1945, an essay by George Orwell appeared in the first edition of Polemic. Edited by abstract artist and ex-Communist Hugh Slater, the new journal was marketed as a “magazine of philosophy, psychology, and aesthetics.” Orwell was not yet famous—Animal Farm had only just started appearing on shelves—but he had a high enough profile for his name to be a boon to a new publication. His contribution to the October 1945 Polemic was “Notes on Nationalism,” one of his best and most important pieces of writing. Amidst the de-Nazification of Germany, the alarmingly rapid slide into the Cold War, and the trials of German and Japanese war criminals, Orwell set out to answer a question which had occupied his mind for most of the past seven years—why do otherwise rational people embrace irrational or even contradictory beliefs about politics?
As a junior colonial official in Burma, the young Eric Blair (he had not yet adopted the name by which he would be known to posterity) had been disgusted by his peers and superiors talking up the British liberty of Magna Carta and Rule Britannia while excusing acts of repression like the massacre of Indian protestors at Amritsar in 1919. As a committed socialist in the late 1930s, he openly ridiculed those who claimed to be champions of the working class while holding actual working-class people in open contempt. And he had watched the British Communist Party insist that the Second World War was nothing more than an imperialist adventure right up until the moment when the first German soldier crossed the Soviet frontier, at which point it instantly became a noble struggle for human freedom.
Orwell’s most personally searing experience, though, had come in Barcelona in 1937. The previous year, he had travelled to Spain to fight in the Civil War on the Republican side. His poor relationship with the British Communist Party led him to enlist in the militia of an anti-Stalinist socialist party, the POUM (Partido Obrero de Unificación Marxista, or Workers’ Party of Marxist Unification). Even while it was fighting a bitter winter campaign in the Aragon mountains, the POUM was subject to a relentless propaganda campaign by pro-Soviet Republicans who insisted it was a secret front for fascism.