It seems to me that posting flyers on mailboxes on the side of a street, without approaching any other people or or their property is pretty explicitly an excer

It seems to me that posting flyers on mailboxes on the side of a street, without approaching any other people or or their property is pretty explicitly an excercise in free speech. Especially when describing public information about public officials. Arresting those folks, putting them in solitary confinement, and holding them without bond when they were arrested for a non-violent charge and have no previous criminal record - that is more of an intimidation tactic than any fliers could be.