Mr. Ditko has largely been a self-published (and private) cartoonist for the past 3 decades.
http://en.wikipedia.org/wiki/Mr._A
Mr. A is one of the clearest examples of Ditko's belief in Ayn Rand's Objectivism. Typical stories will have one character convince him or herself that doing just a few illegal acts to get ahead in life will not make him or her a bad person. This character's crimes escalate when they must either take action to cover their previous misdeeds or are now too closely tied to more dangerous criminals to simply walk away. The stories invariably end with Mr. A confronting the criminals and telling them that they are all guilty, including the character who had wished to remain good. A staple for most stories involves this character trying to justify his or her immoral actions to both others and him or herself, blaming things such as environment and society rather than taking responsibility.Almost every character speaks about the ideological reasoning behind their actions on every panel, thus showing that the adventure story is not meant to be just entertainment, but is to show an ideological dialogue and hopefully sway readers over to Objectivism.
Not all of Mr. A's stories are crime adventures. Some are allegorical representations of the guilty trying to explain why they compromised their values. Mr. A, on a white platform, denounces their explanations. These stories typically end with the guilty falling into an abyss off of their black platform. This representation often occurs at the end of the adventure stories as well.
Detractors have said that Mr. A is an unfeeling character who offers no remorse or mercy to criminals. In the stories themselves Mr. A says that he feels only for the innocent and victimized. His brand of justice might seem harsh to some, but on the other hand his punishments for criminals arguably fit the crimes they committed. People who commit "just one crime", such as accepting dirty money are turned over to authorities to stand trial for what they have done. Mr. A refuses to overlook their transgressions, even if they profess they will be good from then on. Killers and would-be-killers generally find themselves in situations where they need Mr. A's assistance to save them, but since they had no respect for innocent lives then he offers no aid for their guilty ones. It is only when an innocent life is directly threatened that Mr. A will kill, and when he does so it is without remorse.
Ditko responded to his critics in a Mr. A essay titled "Violence the Phoney Issue", printed in Guts #5 in 1969. This essay was reprinted on the web site "Dial B For Blog" #298.
Note if you do manage to go to the Wikipedia entry, it incorrectly states that a character in Alan Moore's The Watchmen was based on Mr. A. Whoever wrote it was wrong. The characters in The Watchmen were based on the old Charton Comics characters which Warner-DC had acquired through mergers. Moore's character was based on Charlton's The Question, who was a "more marketable" similar character. And there is mention made of Moore's other fannish referencing this work. Mr. Moore was the author of V For Vendetta. It is safe to say that Moore and Ditko do not share political viewpoints.