The "held through fraud" part maybe what distinguishes legitimate prisoners from slaves. Although, that part of the definition does seem strange, I'm not sure

The "held through fraud" part maybe what distinguishes legitimate prisoners from slaves. Although, that part of the definition does seem strange, I'm not sure if we'd always want to require that someone be held through fraud to be considered a slave (someone chained to a post and forced to do hard labor is still a slave in my book, but I don't see any fraud involved).