Who confronts Atticus at his own house in To Kill a Mockingbird?

A group of concerned citizens came to visit Atticus on his
front lawn just days before the beginning of the Tom Robinson trial. Among those present
were Sheriff Tate, Link Deas, Dr. Reynolds and Mr. Avery. Atticus directed the children
to go back into the house, so they could not hear the entire conversation, but Scout did
hear the sheriff mention that someone was being moved "to the county jail tomorrow."
Heck said that there might be trouble with "that Old Sarum bunch," and Atticus asked
about a "change of venue." It all seemed quite "ominous" to Jem, so he suddenly screamed
to Atticus that he had a telephone call. There was no call--Jem was only trying to give
Atticus an excuse to come inside, since he thought the crowd might actually be a danger
to his father.