[Just mythoughts]

The last paragraph is the killer. Everyone focuses on the swimmer’s sexual escapades but his getting in bed with the KGB was the real threat. The KGB must of had a whole bunch of stuff on the Kennedy family going back to Daddy.

Wasn't the Pope at that time also working to pull down the 'iron curtain', or was that after Teddy signed to help the KGB?

[Jimmy Valentine's brother]

You are correct! Margaret, Ron, John Paul and Lech on one side Teddy and his crew on the other.