The full text on that banner is "The World's Greatest Hero Abides By The Law"
Evey had to do a lot of community service. Some of this included giving talks at public schools about doing things by the book and following the rules. They really had to squash the idea that breaking every rule is a good thing to do. They had to emphasize that they got lucky and not everyone can count on that. Let's hope they took their own advice.
Also you can join the discord. It's our new comments section! https://discord.gg/XPPdEyN