Baloney. As someone who deals with the military industrial complex on a daily basis, I know for a fact that the forms you submit to the OPM ask you in plain English "have you ever belonged to an organization dedicated to the violent overthrow of the US government" and these forms are retained by the OPM for something like 7 or 10 years, after which you are required to resubmit them. If she said "no" to the question in question, but knew that her acquaintances went to jail, something objectively doesn't add up. The best possible excuse is that she's just pathologically oblivious, not that the OPM has trumped up charges out of nowhere.
I don't have mod points to upvote so I'll brave the repost of this. This person is not a troll, they are stating facts. Omission on an SF86 is the same as a lie. Not only do they specifically ask you about groups advocating the overthrow of the government they also ask you about ANY political group affiliations.
Anyone filling out an SF86 should two simple facts: 1) the lie is always worse than the fact and 2) when in doubt WRITE IT DOWN!!! The worst that happens is you've wasted some time writing it down and wasted some time of the investigator/adjudicator.
Let's be clear: I (and thus we) do not have enough facts even from TFA to really make an informed assessment. But parent is not wrong, not a troll, and for what we do know from TFA is on-topic.