As a Fed employee, my supervisor and his supervisor (two) could ‘threaten’ me, lock my office, etc. to stop what I believe are my duties.
They never got charged or locked up.
What is the statute of limitations?
And if you worked in certain departments Congressmen, Senators, and various candidates for office regularly suggested that they would close down the entire department. Is that "intimidation"?
I think there were statutes which could have been appropriately charged against the people occupying the nature preserve. Trespassing, for instance, perhaps breaking and entering. If actual, specific threats were made, then those too may be criminal acts.
But I don't think it is a good trend for our society to have legal prosecutions based on stretched interpretations of the law. There seem to be multiple cases recently where that is happening - like the situation in Texas where people reporting on apparent wrongdoing are charged. Everybody knows the activists filming at Planned Parenthood weren't really trying to acquire fetal tissue as their end goal, any more than an undercover DEA agent is trying to buy drugs as his end goal in an investigation.
Prosecutions brought on charges which appear concocted to make a political point undermine faith in our justice system.