Angry letter was sent by John Lennon to Paul and Linda McCartney in 1971

Lennon rants at the couple for their treatment of his new wife Yoko Ono 

The letter is now being sold by a Boston auction house for $20,000

McCartney has since talked about his strained relationship with Lennon after the Beatles split up 

A furious letter from John Lennon to Paul and Linda McCartney about their treatment of Yoko Ono is being auctioned in the United States.

The typed correspondence, which also includes hand-written annotations by Lennon, shows the extent of bitterness between the pair after the break-up of the Beatles.

Believed to date from 1971, the angry letter was in response to criticism he had received from Linda, whom McCartney had married two years earlier…. read more here