If you are interested in learning more about the rights issues of wrestlers, then the WWE episode of Last Week Tonight with John Oliver is a good starting point since they take on heavy topics with a laugh and well researched material. Jesse Ventura clips on YouTube as well are a good listen.
I would caution about heading too far down the rabbit hole given the subject matter, if this in any way significantly impacts your enjoyment of the spectacle that is wrestling, if you were unaware of these issues previously.