Just being in a chat group on Signal where classified information is being shared and not reporting it is a crime if you have a security clearance. I used to have a security clearance. Classified information cannot be discussed outside of a secure compartmentalized information facility or SCIF for short. Classified information cannot be stored on your personal phone. You can’t take hand written notes about what was discussed inside the SCIF, outside of the SCIF. Digital communications of classified material can only take place on a secure government network; SIPR network for Secret information, JWICS and NSA Net for Top-Secret information. Those networks work exactly like the common internet everyone uses, which is called the the NIPR network, but only people with approved accounts and a security clearance can sign into SIPR, JWICS and NSA Net and the computers that can access the networks are inside a SCIF. Everyone who was in that Signal group and had a security clearance should be looking at a long prison sentence for not reporting the leak.