poacher turned gamekeeper
Sadly, I don't think that there are many tigers who have really changed their stripes.
If someone really has "turned" I'd be grateful if they would work on my behalf.
I'm not aware of modern examples but.. I'm sure there are some around. Any names to share?
From US history, Franklin Roosevelt comes to my mind.
At least I was taught that his own social class felt betrayed by him.
Intimate knowledge their systems & practices resulted in his political effectiveness.
But....I'm sure not everyone was taught this same history.