I think it's commonly known, maybe not proven, but also it's a case of can they? yes. Would they? yes. As long as you agree with those two premises it's pretty likely
Genealogists use parallel construction to build out their families. Data from a large variety of sources gets used to indicate and corroborate individuals.
It's rather annoying that the initial knee jerk reaction to any negative take on authoritarian government action is labeled as a conspiracy theory to try to discredit it.
The CIA did a great job getting that word out there. It's sad it's used to dismiss credible and logical conclusions so readily.
