From One Night on TV is Worth Weeks at the Paramount : Popular Music on Early Television, by Murray Forman:
"We should eliminate the word 'nigger' whenever possible. Of course, these darkies put a lot of pressure on us and they are sometimes too exacting, and there are certain songs where the word 'nigger' must be used. However, it is wise to cut it out as much as possible."
-John Royal, vice president of programs at NBC, 1935.