Look up the Battle of Athens. In a nutshell, some veterans returned home from fighting the war to find out that their local government had become oppressive - levying insane fees on speeding tickets, committing false arrests, taking bribes, etc.

On top of all that, the local Sheriff had rigged the ballot box to ensure that they stayed in power, denied some the right to vote, and overthrew poll-watchers through force.

The returned veterans recognized all of the above as tyranny, had put forth honest people for the election, and insisted that the election was done fairly be surrounding the Sheriff's office where the ballots where and mounting an armed resistance to ensure that tyranny wasn't done.