How are Atticus Finch, Tom Robinson, and/or Boo Radley portrayed as mockingbirds? Give specific examples from To Kill a Mockingbird to support your...

As the previous post noted, mockingbirds are innocent
creatures who don't harm humans or their crops, only making beautiful music for people
to enjoy. The author has created several symbolic, human mockingbirds in her
story.

Boo Radley is one. He is accused of all sorts of
nocturnal crimes, but there are actually no witnesses (Miss Stephanie's unreliable
gossip notwithstanding) to any of Boo's supposed activities. He leaves gifts in the
secret knothole in order to make friends with Jem and Scout, giving them pleasure and
wonderment from the personal items they receive. He mends Jem's pants following the
children's raid on the Radley House, and he warms Scout with a blanket on the night of
Miss Maudie's house fire. At the end of the story, he saves both of the children's lives
by fighting off, and killing, the murderous Bob Ewell.

Tom
Robinson is another innocent accused of crimes he did not commit. A hard-working family
man, Tom goes out of his way to help Mayella Ewell with an occasional chore, knowing
that his appearance on the Ewell property may be hazardous to him. She repays his
kindness by accusing him of assault and rape. Atticus' staunch defense seemingly proves
his innocence, but the jury doesn't see it that way. When Tom can stand being caged no
longer, he is shot dead--with seventeen bullet holes--by overzealous prison
guards.

Atticus is forced to accept the defense of Tom
Robinson--a case that he does not want to take. The fallout of his defending a black man
accused of raping a white woman puts his life, and his family's, in danger. Sheriff Tate
insists that he take the shot that kills Tim Johnson, the mad dog, even though Atticus
has given up guns because he hates the thought of killing.