Careful, your ignorance and paranoia are showing:
1) American Sign Language, used in the US, Canada and Mexico, is a real an actual language.
http://www.lifeprint.com/asl101/pages-layout/history3.htm
2) Helen Keller did not invent or create "the hand sign system for the deaf,".
3) "The ILY (I Love You) Sign is similar, but unrelated to the Diablo sign" that you discuss. https://en.wikipedia.org/wiki/ILY_sign
4) A lot of people were Communist during this time period and read many of the same authors. It is a reflection of the times, not necessarily a reflection of the value of a person. It is entirely unfair to judge historical figures in hindsight.
5) You should really post your own thoughts and be careful to avoid plagerism. Not good form.
http://www.whale.to/b/hand.html
BAFH