People
I have almost reached the regrettable conclusion that the Negro's great stumbling block in his stride toward freedom is not the White Citizen's Councilor or the Ku Klux Klanner, but the white moderate.
— Dr. Martin Luther King Jr.

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker expresses disappointment that the biggest obstacle to racial progress isn't overt extremists but people who claim support while resisting urgency, calling this the white moderate. It criticizes comfortable inaction disguised as caution, arguing it stalls change more than open hostility does.
Context reviewed