they don't need to investigate the substance of whatever someone might be testifying about before congress.
it's enough to know that they have been called to testify and that they're being intimidated out of appearing.

to the incident.. like relative or friend, etc. Then that would open it up to investigating the incident.

would know that and pass the threats on to the FBI. Those threats are a separate issue from what allegedly happened at the party.

Asha Rangappa is a former FBI agent and now teaches national security at Yale.

https://www.democraticunderground.com/?com=view_post&forum=1002&pid=11154126

Link to tweet

Tribe was also saying that the investigation into the harassment would then lead to an investigation into the original rape allegation.

Asha, who is also liberal, a former FBI agent and lectures at Yale, says that the way the FBI works, the harassment/death threats and hacking/doxxing would be investigated, but she did not see any way that it would lead to the FBI also investigating the rape allegations, which she felt was a Maryland Law Enforcement issue.

Couldn't they just start an investigation because they have reason to believe that a crime was committed? Or if not the FBI, the AG of Maryland? Or somebody? Who decides whether or not to investigate a sexual assault on a person whose (alleged) attacker isn't a nominee for the Supreme Court?