Conversation so far:
Where did Medgar Evers and Myrlie Evers move to?
Medgar Evers and Myrlie Evers moved to Mound Bayou.
What state was Mound Bayou in?
Medgar Evers and Myrlie Evers moved to Mound Bayou, Mississippi.

Question: What was special about the town?
Self-contained rewrite: What was special about Mound Bayou, Mississippi for Medgar Evers?