Why was red hand painted on actor D'Pharaoh Woon-A-Tai's face at Emmys?

'Reservation Dogs' actor D'Pharaoh Woon-A-Tai walked the Emmy Awards red carpet with a red handprint on his face to bring awareness to the Missing and Murdered Indigenous Women movement (MMIW). "There's a very big epidemic in the United States and Canada where our sisters, our relatives, our two spirited relatives are going missing at an alarming rate," he said.