Both Uses

insistent
in
Black Like Me
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From "Dream Variation" Langston Hughes October 28, 1959 For years the idea had haunted me, and that night it returned more insistently than ever.†
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insistently = in a persistent or firm manner
Local white leadership was discredited in the eyes of black people, too, by their insistence on asking me, when we met to discuss the local events, usually with black people, if I had discovered who was the traveling black agitator who had come in and stirred up their "good black people."†

insistence = demand or persist

Definitions:

(1) (insistent)
persistent or continuing or firm -- especially in maintaining a view or demanding something
(2) (meaning too rare to warrant focus)