[3][4] Upon her return to Massachusetts, she became actively involved in the suffrage movement,[5] becoming the president of the Cambridge Political Equality Association (CPEA) of MA in 1910,[3] which she founded in 1896.
[6][3] Johnson served as president of the CPEA for six years, during which she focused her efforts on rallying public support for women's suffrage in Massachusetts.
She advocated for the adoption of a state constitutional amendment to enfranchise women and played a key role in organizing suffrage rallies, canvassing voters, and writing pro-suffrage articles.
She traveled to Geneva in 1926 to observe the League of Nations in action and dedicated herself to educating the public about international affairs and peace initiatives.
In addition to her activism, Johnson had a distinguished career in education, teaching International Affairs and Parliamentary Procedures at the Garland School for Homemaking in Boston.