This article should be divided into sections by topic, to make it more accessible. (April 2022)
In 1948 Bromley left the staff of the Fellowship of Reconciliation (where she had been A.J. Muste's secretary) to avoid the withholding of taxes on her paycheck. Bromley helped found the group Peacemakers later that year, and concentrated her focus on the organization of war tax resistance by that group.
She participated in the campaign to desegregate the Coney Island amusement park in 1952. She was with a black couple in a car that attempted to gain access to the park but was attacked by an anti-desegregationist mob (the occupants of the car were charged with disorderly conduct).
The first war tax resistance "how to" guide, Handbook on Nonpayment of War Taxes, was published by Marion and Ernest Bromley in 1963.
Bromley participated in the first meeting of the National War Tax Resistance Coordinating Committee in 1982.
- Moores, Lew (January 24, 1996). "Obituary for Marion Bromley (Aged 83)". The Cincinnati Enquirer. p. 14. Retrieved April 26, 2022.
- Long, Naomi (March 30, 1949). "Fighting for peace". The Akron Beacon Journal. p. 6. Retrieved April 26, 2022.
- "Peacemakers speak to Ball State crowd". The Star Press. October 29, 1980. p. 9. Retrieved April 26, 2022.
- Mong, Bob (May 29, 1975). "Bromley world meets IRS world". The Cincinnati Post. p. 3. Retrieved April 26, 2022.
- Battaglia, Alice (February 20, 1975). "Pacifists charge fraud in IRS seizure of home". Union-Liberty Journal. p. 1. Retrieved April 26, 2022.
- Bunting, Ken (September 1, 1975). "Bromleys win battle for their farmhouse with IRS reversal". The Cincinnati Post. p. 1. Retrieved April 26, 2022.
- "Marion Bromley and Ernest Bromley Papers (DG 214), Swarthmore College Peace Collection". www.swarthmore.edu. Retrieved April 26, 2022.