The Texas Chainsaw Massacre (both versios) was loosly based on Ed Gein, a serial killer from the '50s i believe. How he is related to the movie is that he would carve people up and make suits out of them and wear them around his house. That whole crime scene and the rest of the movie is Hollywood's imagination and never really happened.

http://experts.about.com/q/Cult-Movi...aw-Masacre.htm

http://movies.go.com/movies/movie?na...mp=KNC-BROIKAN

http://www.crimelibrary.com/serial_k...in/bill_1.html

Hope that helps.

Here's one more about Leatherface...

http://www.crimelibrary.com/serial_k...s/1_index.html