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Joseph McCarthy's infamous crusade in the 1950s whipped up a frenzy of anti-communist sentiment across America – and wrecked the reputations of scores of people accused of harbouring sympathies for the Soviet Union. So what motived the Wisconsin senator, and why did McCarthyism prove so alluring? Here, in conversation with Spencer Mizen, Nick Bunker discusses one of the most controversial figures in US political history. The HistoryExtra podcast is produced by the team behind BBC History Magazine. Learn more about your ad choices. Visit podcastchoices.com/adchoices