One of the many things that inspired me to write Freaks: Alive, on the Inside! was the 1933 movie Freaks directed by Tod Browning. I've just found the whole movie on line! Now you can see it.
[I had to remove this video because the link didn't work anymore and attempts to link to a non-existent movie were crashing browsers. Oh, well]
I found it on the Internet Archive thanks to Boing Boing.