I've heard this story before. Will someone please produce the KGB document. That would be all that is needed to proceed with treason charges.
Did you read this article? It wasn't only Kennedy. There were other senators too, and the "envoy" was himself a senator. The original Kennedy-Soviet relationship was against the Carter WH. At the time, Carter and Kennedy were battling for the Dem nomination. This is pretty explosive stuff. I'd like to know the identity of the other senators.