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.
What was special about Mound Bayou, Mississippi for Medgar Evers?
Medgar Evers and Myrlie Evers moved to Mound Bayou, Mississippi, a town developed by African Americans.
What did Medgar Evers do in Mound Bayou, Mississippi?
Medgar Evers became a salesman for T. R. M. Howard's Magnolia Mutual Life Insurance Company.
What did Medgar Evers do in his free time?
Medgar Evers was also president of the Regional Council of Negro Leadership, which began to organize actions for civil rights.
What else did Medgar Evers do for the group?
Medgar Evers helped organize the Regional Council of Negro Leadership's boycott of gasoline stations that denied blacks the use of the stations' restrooms.

Question: What years was this?
Self-contained rewrite: What years was Medgar Evers part of the Regional Council of Negro Leadership?