Who are Mr. Underwood and Heck Tate?
Mr. Underwood's full name is Braxton Bragg Underwood, and is sometimes also referred to as B.B. Underwood. He is the owner of the local newspaper and claimed to hate black people. However, despite his claims to not like black people, he was prepared to protect Atticus Finch and Tom Robinson from the lynch mob.
Heck Tate is the sheriff of Maycomb. He is very understanding and empathetic towards Atticus Finch. As a result, he agrees to keep it a secret that Boo Radley was involved in the death of Bob Ewell.