In the spring of 1967, Lewis became the first woman to join the
Black Panther Party, at the age of 16. Lewis contributed over forty images to the newspaper between 1967 and 1969 under the pen name "Matilaba". Most of the artwork that came out of the newspaper and the party itself is attributed to Emory Douglas, yet Lewis' drawings were prominently featured alongside his. Lewis worked as his assistant during her time spent in the party. Her work was easily identified by its thin pen strokes, and the light shading that outlined her usually militant female caricatures. Lewis' art usually represented common themes of the newspaper, including demonizations of the
police as "pigs", as well as depictions of armed Panthers, which reinforced Black Americans struggles against
police brutality. What made her art stand out was its depictions of armed black women Panthers rather than only black men, a shift from the very masculine representation of
militant self-defense usually pictured in the newspaper. Through both her artwork, as well as her involvement in training camps and
police patrols, Lewis created a space for Black women to embody the image of radical defenders of the community and culture. Lewis left the Black Panther Party in January 1969. == Art career ==