The FBI isn’t exactly a small group of people and there probably aren’t too many people there now that were around in the MLK days.
If you’ve ever worked anywhere you’ll know there’s going to be good people in the workplace and also some really shit people. All companies, government institutions, educational institutions, political parties, and yes even non-profit organizations are like this. If you measure the value of an organization be the actions of the worst people in that organization through all history, then all organizations are horrible things, and you should just go live alone in a cabin in the woods because everything is terrible.