Long, but worth a read ....
PROLOGUE: THE INFORMATION WAR
In 1950, Sen. Joseph McCarthy claimed that he had proof of a communist spy ring operating inside the government. Overnight, the explosive accusations blew up in the national press, but the details kept changing. Initially, McCarthy said he had a list with the names of 205 communists in the State Department; the next day he revised it to 57. Since he kept the list a secret, the inconsistencies were beside the point. The point was the power of the accusation, which made McCarthy’s name synonymous with the politics of the era.
For more than half a century, McCarthyism stood as a defining chapter in the worldview of American liberals: a warning about the dangerous allure of blacklists, witch hunts, and demagogues.
Until 2017, that is, when another list of alleged Russian agents roiled the American press and political class. A new outfit called Hamilton 68 claimed to have discovered hundreds of Russian-affiliated accounts that had infiltrated Twitter to sow chaos and help Donald Trump win the election. Russia stood accused of hacking the social media platforms, the new centers of power, and using them to covertly direct events inside the United States.