This is fascism, folks. Not only can it happen here, it HAS happened here.
“So they are in jail for exercising their right of free association.”
I looked up restrictions for people out on bail. In short, they are whatever the judge sets. In general, you are required to live at a particular address and may be required to be there all night. But other restrictions are possible. Violation of any restriction is a criminal offense. I am guessing that the defendants were restricted in their ability to travel. Probably in other ways as well.