LONDON—A former spy from Soviet-era Czechoslovakia claims that several hard-Left British politicians—including current Labour leader Jeremy Corbyn—were paid up to $15,000 each to hold secret meetings and pass information to Communist agents during the Cold War.

The claims have been dismissed as the fabrications of “a fantasist” by a Labour spokesman, although a newly uncovered dossier first published by The Sun last week showed that Czech intelligence officials had a file detailing...

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