Final answer:
Mamie Clark's main goal in her work at Northside in Harlem was to provide social services based on her psychological research to support mental health and racial identity in the African American community.
Step-by-step explanation:
The guiding goal of Mamie Clark's work at Northside in Harlem was to apply her psychological research with her husband, Kenneth Clark, to practical social services that could directly benefit the African American community. Through their work, they established the first child guidance center in Harlem. Their groundbreaking research on African American children's racial identity and preferences played a key role in the landmark Brown v. Board of Education Supreme Court case that declared school segregation unconstitutional. Mamie and Kenneth Clark's dedication to improving the lives of black children in their community through mental health services reflects a broader historical context wherein activists like the Harlem Nine fought for educational equality, and others like Maggie Walker and the participants in the Harlem Renaissance paved the way for black self-determination and empowerment.