Robert Heinlein

To tell the truth, I don't know much about his work.  But I do remember reading a couple of his books while I was  in grade school.  I forgot which book it was, but I remember something from it, and based upon that, I did a google search, giving this.  The thing I remembered was the term "fraki", so I googled that with Heinlein, and that is how I came up with the link.  The word "fraki" was a pejorative word, you see.

The other book's setting was on Mars, but I haven't located that one yet.  It could be this, but I am not sure.