The way the SDS and Weathermen did it, prior to coming to power and influence with the White House....was they lawyered up fairly early in any sort of conflict so their attorneys got notice whenever warrants were issued against anyone in the organization.
Cooperative defense agreements are held on file so that they cannot legally be called to testify against each other as codefendents, but that did often open certain aspects of certain cases up to conspiracy charges.
The federal public defenders traditionally assign different attorneys to different defendants AFTER indictment, so a person has no legal representation during much (if any) of the pre-arrest phase and that critical 48 hours which is generally allowed between arrest and indictment, when interrogation is often the most severe.
Pre-assigned attorneys slows down any process by which someone can be compelled to break from the group and testify against the others. Now that does not prevent someone from being a confidential informant, but it slows it down, especially if they are present for any legal strategy meetings and it comes to light later on in court that their presence was to undermine a legal defense. It may not prevent a conviction, but it provides ground for an appeal, even years after a conviction.
It is one thing to issue warrants on everyone, another to actually catch them, another to gain indictments, and yet another to be able to get any charges stick.
I just personally see this as Adam Kokesh times 50 but time will tell whether or not it has been an effective tool in the conflict to do these government building armed tresspass stunts.