In early 2019 Stein joined the Women's March leadership, as a member of the 2019 Steering Committee.
Despite some controversy surrounding the March and its leadership, Stein said that “I’m convinced that working with Women’s March people, we can gain so much more by working together even when there might be some parts we feel uncomfortable with,” and "expressed solidarity with other Jewish women who are supporting the march on grounds that it has emerged as an important and growing coalition of marginalized groups including Jews, African Americans, Hispanics, and LGBT people."

During the rally following the march, Stein also spoke on stage alongside Reverend Jacqui Lewis, senior minister of Middle Collegiate Church, and Muslim activist Remaz Abdelgader, leading the spiritual invocation opening the rally.
During her speech, which she started with the traditional greeting of "Shabbat Shalom," she related the march to the Exodus, leading the audience in chants denouncing different forms of prejudice and oppression with a chant of "Let It Go."
She also called for unity saying that "A lot of people out there, a lot of people in the media are trying to divide us.
What brings us together is not the fact that we are all the same.
What brings us together is our differences."

In 2020 Stein was a featured speaker at the Women's March NYC, in Foley Square.
In early 2019 Stein joined the Women's March leadership, as a member of the 2019 Steering Committee. Despite some controversy surrounding the March and its leadership, Stein said that “I’m convinced that working with Women’s March people, we can gain so much more by working together even when there might be some parts we feel uncomfortable with,” and "expressed solidarity with other Jewish women who are supporting the march on grounds that it has emerged as an important and growing coalition of marginalized groups including Jews, African Americans, Hispanics, and LGBT people."
During the rally following the march, Stein also spoke on stage alongside Reverend Jacqui Lewis, senior minister of Middle Collegiate Church, and Muslim activist Remaz Abdelgader, leading the spiritual invocation opening the rally. During her speech, which she started with the traditional greeting of "Shabbat Shalom," she related the march to the Exodus, leading the audience in chants denouncing different forms of prejudice and oppression with a chant of "Let It Go." She also called for unity saying that "A lot of people out there, a lot of people in the media are trying to divide us. What brings us together is not the fact that we are all the same. What brings us together is our differences."
In 2020 Stein was a featured speaker at the Women's March NYC, in Foley Square.
Abby Stein