Confused by downvotes. It is a historical fact that there were assassinations plots during the Cold War. It was investigated and declassified by Congress. For starters, look at the Church Committee, a U.S. Senate Committee from 1975, that investigated intelligence malpractice.

There should be nothing remotely controversial about these events existing.

Second, by asking a clarifying question I am not implying that the "US is not currently in the business of assassinating high-visibility targets" because I have no way of knowing this. I just want to clarify this person's point-of-view.