Some context from this story (hopefully I'm within copyright limits for fair use, tried to clip it to a minimum, these are not complete paragraphs):

...the evidence is now clear that Nixon created the Watergate burglars out of his panic that the Democrats might possess a file on his sabotage of Vietnam peace talks in 1968.

...

The disruption of Johnson’s peace talks then enabled Nixon to hang on for a narrow victory over Democrat Hubert Humphrey. ... the new President ... sensed the threat from the wiretap file and ordered two of his top aides, chief of staff H.R. “Bob” Haldeman and National Security Advisor Henry Kissinger, to locate it. But they couldn’t find the file.

We now know that was because President Johnson, who privately had called Nixon’s Vietnam actions “treason,” had ordered the file removed from the White House by his national security aide Walt Rostow.

Rostow labeled the file “The ‘X’ Envelope” and kept it in his possession ...

Ironically, too, Johnson and Rostow had no intention of exposing Nixon’s dirty secret regarding LBJ’s Vietnam peace talks, presumably for the same reasons that they kept their mouths shut back in 1968, out of a benighted belief that revealing Nixon’s actions might somehow not be “good for the country.”

(after getting re-elected) Nixon then reached out to Johnson seeking his help in squelching Democratic-led investigations of the Watergate affair and slyly noting that Johnson had ordered wiretaps of Nixon’s campaign in 1968.

Johnson reacted angrily to the overture, refusing to cooperate. On Jan. 20, 1973, Nixon was sworn in for his second term. On Jan. 22, 1973, Johnson died of a heart attack.

So, Parry says LBJ wouldn't release the 'X' Envelope "out of a benighted belief that revealing Nixon's actions might somehow not be "good for thee country". That seemed odd to me, didn't pass the smell test. But if this info had its roots in an illegal wiretap of Nixon's campaign by LBJ, it makes a lot more sense.

Major kudos to Parry for this article. The whole thing should be read by anyone wanting to understand our actual history. Both the Nixon and Reagan-Bush administrations came to power by defeating peace efforts / hostage releases at the end of the prior Democratic administration.

History seriously needs to be rewritten, so we can go forward without the blinders and be willing to critically examine all possible explanations of major political events. We pay for this naivety with our freedom, living under illegitimate power. It wouldn't surprise me at all to see this kind of thing go down near the end of Obama's term to bring Jeb into power.