[4] During World War I Baer relocated to Munich and became involved with Heymann, Anita Augspurg and Helene Stöcker in the Pacifist Movement.

[1] Between 1918 and 1919, Baer set up a women's council in the Munich Ministry of Social Affairs, for the newly created Bavarian Soviet Republic.

[9][8] She missed her meeting with President Harding, when immigration detained her because of her membership in the Communist Party of Germany and fears that she had insufficient funds to support herself while in the country.

[9][10][11] Released after the intervention of Jane Addams, Baer, when speaking at a later meeting, urged women to join in the peace movement and anti-war demonstrations.

[12][13] Giving lectures with members from Britain and France, Baer urged the United States to withdraw troops from Latin America, to release political prisoners, and to recognize the Soviet Union.

[17] Upon Addams death in 1935, it was decided to have Baer, Ragaz and Cornelia Ramondt-Hirschmann, continue the shared responsibilities as WILPF chairs.

[15] Making her third trip to the United States that year, Baer participated in a disarmament conference, appealing for the nations of the world to work together for peace.

[23] Some of the initiatives she was involved in were urging the World Health Organization to investigate what effect atomic tests and specifically radiation posed to the population.

Beginning in 1955, she stressed the need to utilize solar energy, rather than pursue nuclear power,[24] and in a 1960 campaign urged rural education through radio broadcasting.

[25] In 1965, at the fiftieth anniversary convention for the creation of WILPF, Baer expressed her frustration that the organization had moved away from its feminist roots, reminding members that until full equality in all spheres of life had been attained, women would remain at risk.

[26] The following year, as an observer to the UN NGO Forum held in Rome, Baer again spoke about the links between feminism and pacifism, while urging self-determination for Viet Nam.