How is any of what’s alleged a federal beef?
.....some of it happened across state lines......
Usually, if the Feds want to “get” somebody, they can find something to connect with RICO law.
Anyhow, what are the chances the fat ol’ perv never coerced a chick to accompany him to Vegas or similar — to another state? Any mail sent that was in any way connected to what he did? It’s FBI territory at that point.
Sadly, probably a lot of this stuff is long past statute of limitations.