Uncle Tom had an inferiority complex towards others. He was very submissive and always behaved like he was willing to accept his faith. His only strength was his willingness to believe in God despite all of the hardship he endured until his death by the hands of Legree´s men. He did manage to change the attitudes of the people and positively influence them into setting aside their prejudices and becoming Christian.
On the other hand, the Harris Family refused to accept their faith and decided to risk it all and embark to Canada. This led them to encounter the slave trader Tom Locker, who ends up injured after fighting with them. He is also, in a way, induced into setting aside his prejudices as he is assisted and taken to a Quaker settlement to recover.
Is very simple, although the term "chaser" may not be as commonly used as it was when John Collier wrote his story. A chaser is a drink that is taken to follow the first alcoholic drink.