Joyner served as a founding member of the National Council of Negro Women, aimed at advancing the interests of Black women.
In 1935, Marjorie Joyner helped establish the National Council of Negro Women, an organization dedicated to addressing the needs and rights of Black women. As a founding member, Joyner collaborated with visionary leaders to create this influential body, amplifying the voices of African American women in societal and political discourse. The council's foundation was a testament to Joyner's enduring dedication to community activism and empowerment.