Savanna's Act or the #MMIW Act (MMIW meaning Missing and Murdered Indigenous Women) reforms law enforcement and justice protocols appropriate to address missing and murdered Native women, and for other purposes.

[2] The bill, after the 2018–19 United States federal government shutdown reintroduced in 2019 as S.227, was nicknamed after Fargo, North Dakota resident Savanna LaFontaine-Greywind, who was brutally murdered in August 2017, as an example of the horrific statistics regarding abuse and homicide of Native American women.

[4][5] Initially just a method to improve data collection on missing and murdered Indigenous women to address that crisis for law enforcement bodies on both reservations and non-reservation US territories, modifications to give tribal law enforcement access to federal databases seems to expose a lack of trust on both sides.

To help this act along, the S. 982 Not Invisible Act of 2019 was introduced (since replaced by S. 5087) to the House on the initiative of Deb Haaland and Norma Torres and to the Senate by Catherine Cortez Masto on April 2, 2019 to increase intergovernmental coordination to identify and combat violent crime within Indian lands and of Indians.

[10] The story of the LaFontaine-Greywind murder was made into an episode of a true crime series on HLN called "Nightmare in Fargo" in 2021.