
The Federal Records Act was violated several times due to the disappearing messages feature of Signal they were utilizing for their plans. Jeff Goldberg took screenshots of the messages before they were automatically deleted when all Federal Records are legally required to be preserved for archiving and may not be destroyed except under specific parameters that they obviously did not follow.
https://www.ed.gov/about/ed-overview/required-notices/federal-records-act
Also, by using Signal, which is a secure end to end encrypted messenger, the vulnerability that is built into the desktop sync feature where messages aren’t locally encrypted can result in enemy and adversarial nation states collecting these messages due to them being stored on an infected device which can compromise the mission and risk lives.
They could also have their accounts and subsequently their messages hacked with their information widely publicly available to hackers.
Exactly they violated the Federal Records Act for every message that was automatically deleted. Federal Judge Jeb Boasberg is currently presiding over the lawsuit.