As the leader of one of the most significant new forces in organized labor, Ai-jen Poo has become the foremost advocate for living wages and health care benefits for the often ignored and underpaid nannies, housekeepers, and other at-home caregivers all over the country. Since 2010 four states have passed a Domestic Workers’ Bill of Rights—in large part because of this 2014 MacArthur “genius” fellow’s efforts.