Worked in US Customs for a couple of years. The dirtiest LE group there is. Lots of temptation and a 200 year culture of ethical blindness. I could tell you a dozen stories of US vs Them. Theft, collusion, smuggling, indictments all the way up the chain of command.
Now you have the Border Patrol in a situation where their own Supervisors are putting guys like Ramos and Campion in prison for a decade.
This happening in larger Federal agencies. How can a small 20 - 100 man force stop this behavior?