Timely topic and one I have thought a little about.
I think it is organization which takes some time.
As a kid, I read a lot of science fiction. My favorite author was Robert Heinlein, who, I realize now, was a sort of Libertarian.
Recently, I had the urge to start reading some of his stuff
Not sure if I missed this one previously or just forgot it (We're talking 40-45 years ago).
"The Moon is a Harsh Mistress" is one that I'm halfway through now.
It's about a revolution on the moon against the Authority.
In it, he lays out a pretty good blueprint on how to organize and protect against infiltrators as well as protect the organization.
He uses a cell structure with only 3 members per cell. The cells are organized together triangular to form a pyramid.
He goes into a lot of detail on how this protects other adjacent cells and including the ones above.
I highly recommend this book for the present situation.
There's a lot more but just wanted to introduce it here for the concepts