This year Free Comic Book Day lands on Saturday, May 3, 2014. The book that looks most interesting to me this year is Defend Comics, by the Comic Book Legal Defense Fund. Created in 1986, the CBLDF is non-profit organization dedicated to protect the First Amendment rights pertaining to comics and graphic novels.
Sample pages from Defend Comics illustrate topics surrounding the freedom of speech, including the history of the Comics Code.
As an aside, the original version of the Comics Code from 1954 banned many themes associated with horror and fantasy literature. Note the following item under General standards—Part B:
The revised Comics Code from 1971 loosened those initial restrictions:
This revision allowed for a hero billed as The Son of Satan, the transformation of the original Cat into Tigra the Were-Woman, and a storytelling genre that would become the bedrock of the Defenders.