I suspect that other readers of To Kill a Mockingbird have been inspired to investigate parallel real-life racial incidents in their own communities. In my own town of Columbia, Missouri, a black man named James Scott was accused (wrongly, I think) of raping a white professor's daughter in 1923. The local newspaper called for a lynching, and a mob soon formed, including a crowd of several hundred spectators. It is a shocking story. There was some attempt to hold the mob at bay, and then to prosecute the leaders, but Columbia had no Atticus Finch, and the smaller men who were put in his role were ineffective.
I would be very interested in hearing about parallel episodes in other communities, and I'm sure other readers would as well.