McCartney Times

On Aug. 18, 1964, officials in the Denver Police Department alerted the FBI to a threatening letter brought to them by a local promoter.Verne Byers, a musician and Denver nightclub owner, had booked England’s most famous rock ‘n’ roll band to perform at the famed Red Rocks Amphitheatre in Morrison the following week.The Beatles were coming to Colorado.But eight days before the show, a piece of paper arrived in Byers’ hands. The letter, which had arrived inside an envelope postmarked in Greeley, was comprised of cut-out letters from a magazine taped onto plain white paper.

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Source: Inside the violent threat against the Beatles’ only Colorado concert – The Fort Morgan Times