Another Children's Book that Focuses on a Social Issue

Harry Potter and the Sorcerer's Stone is a children's book that almost everyone has read.  The main character, Harry Potter, is an 11-year-old orphan that lives with his careless aunt and uncle and their spoiled son.  Harry has always felt alone and out of place, except for the day he realized that he was a wizard.  Suddenly he is whisked away to the Hogwarts School of Witchcraft and Wizardry.  This book appeals to both adults and children.  For children, it is relatable and fantastical.  For adults, it is just as fantasical, but with underlying complex ideas that go beyond good versus evil.  The book is a good opportunity to talk about various social issues, but I think one of the most compelling social issue and the way it is handled is bullying.
What I think is so interesting about Harry Potter and the Sorcerer's Stone is how author J.K. Rowling handles the mundane.  It's easy for this to be overlooked in a fantasy novel.  In the novel, awkward student Neville Longbottom is constantly picked on by an arrogant student, Draco Malfoy.  Title character Harry and his friends, Ron and Hermione encourage Neville to stand up for himself with Malfoy bullies him.  It's not until the very end that Neville stands up for himself, ironically, to his own friends for breaking the rules for something they believe in.  Later, when Gryffindor and Slytherin and tied for the house cup, it's Neville act of courage what gives Gryffindor the winning points when he stands up to his friends.
Bullying is a hot topic today as extreme cases are portrayed in the media, but it's a serious issue that is unprecedented by law.  There are rules in school, but sometimes they aren't taken seriously.  Sometimes students do not know what acts are considered bullying and sometimes they do not know what to do when they encounter a bullying situation.  Harry Potter and the Sorcerer's Stone is a fun read, but the novel brings up serious social issues that can be explored.