Who rates movies? Who decides what children should and shouldn't watch? Is Be More Specific Rated G? 

Sources:

R. Leone, 2002,Contemplating Ratings: An Examination of What the MPAA Considers “Too Far for R” and Why

https://www.filmratings.com/History

https://www.mtsu.edu/first-amendment/article/1247/motion-picture-ratings

https://en.wikipedia.org/wiki/Motion_Picture_Association_film_rating_system

https://gizmodo.com/a-brief-history-of-the-movie-rating-system-1676334900

https://observer.com/2018/11/mpaa-50-years-movie-ratings-system-changed-film-forever/

https://www.britannica.com/topic/Motion-Picture-Association-of-America

https://www.motionpictures.org/film-ratings/

https://www.motionpictures.org/wp-content/uploads/2018/11/G-is-for-Golden.pdf

https://www.openculture.com/2013/12/a-brief-history-of-hollywood-censorship-and-the-ratings-system.html

https://en.wikipedia.org/wiki/Motion_picture_content_rating_system

https://www.encyclopedia.com/economics/encyclopedias-almanacs-transcripts-and-maps/production-code-administration-hays-office