She is best known for creating the New York Consumers League in 1890.
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Alcohol equivalence is emphasized as being important for drinking in moderation by the National Institute on Alcohol Abuse and Alcoholism (NIAAA), Department of Transportation (DOT), Department of Health and Human Services (DHHS), American Dietetic Association, National Consumers League, National Council on Alcoholism and Drug Dependence (NCADD), and Mothers Against Drunk Driving (MADD).
Overcrowding in places like the Lower East Side led the National Consumers League and other groups to establish the Committee on Congestion of Population in 1907; Marsh was hired as the committee's first executive secretary.
Oral Health America's advocacy centers on bringing oral health care to people in need; in 2009, the organization worked with the American Dental Education Association (ADEA), Dental Health Foundation, National Consumers League, Institute for Oral Health, and the Association of State and Territorial Dental Directors (ASTDD) to implore lawmakers to include oral health provisions in health reform legislation.