Joshua 7

The sin of Achan from Joshua 7 shows all of Israel punished as the result of one man's sins. And while all of Israel was punished because of Achan's crime, it could very well be that many people were aware of the crime and did nothing about it, but simply kept silent. Or its also possible that they saw the plunder that Achan kept and, secretly approving, did nothing about it. The main message here is that there are no private, victimless crimes. All of Israel was held accountable to Achan's sinful act.