Why do Heck Tate, Link Deas ,and others come to the Finch's house?

They are concerned that the "Sarum bunch" will cause some trouble, but Atticus thinks they won't do anything (such as a lynching) on a Sunday night. Mr. Link Deas warns Atticus that he has everything to lose from the trial, but Atticus says that he wants the truth to come out. Jem is concerned that the men outside mean Atticus harm, but Atticus assures him later that those men are his friends and are not part of a gang or the Ku Klux Klan, whom Atticus claims is gone and will never come back. Jem overhears Aunt Alexandra warning Atticus that he is bringing disgrace to the family name. Jem is still concerned for Atticus's safety.