US History: Chapter 9, Exercise 2 — Possible Solution
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WHO ORGANIZED IT
E.D. Nixon orchestrated the initial organizing and selected King as leader
because King was new to Montgomery and had not yet been intimidated by city
officials.

KING'S ROLE
He delivered speeches that mobilized the boycott and became a national figure
through it. The chapter's source deliberately says the boycott "gave King
national attention as a rising leader" rather than saying he initiated the
movement.