I often listen to the Latino USA program on National Public Radio. I heard part of the program tonight, an account of a public hearing about the brutality of the Texas Rangers - the hearing took place a hundred years ago.

I haven't found an archive link for that particular program, but I found another program that looks interesting, titled The Dark Side of the Texas Rangers:

https://www.latinousa.org/2017/03/17/dark-side-texas-rangers/