What did the grimké sisters do?

They were the first women to speak in public against slavery, defying gender norms and risking there life in doing so, ending slavery, their mission was highly radical for the times, and was to promote racial and gender equality.

Spoke against slavery

Explanation:

She and her sister Sarah Moore Grimké were among the first women to speak in public against slavery, defying gender norms and risking violence in doing so. Beyond ending slavery, their mission-highly radical for the times-was to promote racial and gender equality.