Heck Tate is the sheriff of Maycomb County. Heck constantly throughout the story tries to protect innocent people from danger, such as Tom Robinson. 

Also, Heck Tate asks Atticus to shoot the mad dog, Tim Johnson, when it would really be his job.  This is because Atticus has a reputation for being a good shot.  His nickname used to be "One-shot Finch".  At the end of the story, Heck Tate argues with Atticus about the events that happened leading up to Bob Ewell's death.  Heck writes in the official statement that Bob Ewell fell on his knife, although it is unknown whether that is true or not.  He does this to protect Boo Radley, who may have killed Bob Ewell, and keep him out of the public eye.

 Mr. Heck Tate

Dr. Reynolds is the Maycomb doctor. "Had brought Jem and me into the world, had led us through every childhood disease known to man including the time Jem fell out of the tree house, and he had never lost our friendship. Dr. Reynolds said that if we were boil-prone things would have been different...” He is well known to Jem and Scout. He has a strong bond with the Finches.