Aligned with her peace work, she undertook numerous humanitarian drives to assist immigrant communities, reduce strife caused by cultural differences, and improve Italian–American relations.

Slocomb di Brazza campaigned against the death penalty, fighting for a pardon and then assisting accused murderer, Maria Barbella, in gaining a second trial, at which she was acquitted.

The Brazza Cooperative Lace Schools which she initiated are still operational and the peace flag she designed has been widely used in international ceremonies and celebrations.

[1] After his war service, he returned to his partnership in a hardware store which had been founded by his father, successfully accumulating a fortune prior to his death in 1874.

[3][4] Her mother, who worked professionally under the name Abby Day Slocomb, was a Quaker and descendant of Elisha Hinman, a soldier in the American Revolutionary War.

[12] After their marriage, the couple lived at the Castello di Brazza in Moruzzo in the Province of Udine and wintered in Rome at the Palazzo Vaccari on Via del Tritore.

[14] Concerned about the poverty of peasants in Friuli, Slocomb di Brazza created a lace-making cooperative to give the women a means of support during the seasons when they could not work on their farms.

[11][16] Teaching women the skill to make lace, which she had learned in her childhood, she created patterns which incorporated decorative motifs that were traditional in the region.

Slocomb di Brazza spoke English, French, German, and Italian and printed pamphlets in each of the languages to attract consumers from abroad.

[13] To promote the idea of a school, she taught six girls how to make torchon lace by weaving sixty threads on bobbins and had them demonstrate their new skill at the agricultural show they had organized at the castle for September 8.

[21] Following that success, the schools expanded and submitted works to other fairs, winning two gold medals at the 1900 Exposition Universelle in Paris and recognition at the 1905 Liège International, in Belgium, among others.

[23] She developed seven rules of harmony, as guiding principles aimed at achieving personal and world unity, cooperation, justice, and mindfulness regarding the environment.

After reading about the case in The New York Times, Slocomb di Brazza organized efforts to secure Barbella a pardon and to campaign against the death penalty.

[41] As a member of both the American and Italian Red Cross organizations, she spent her time in the United States, assisting humanitarian efforts for soldiers wounded in the Greco-Turkish War.

[42] She made presentations throughout the country with Clara Barton, appealing for American activists to assist Greek women in their relief work.

By 1906 they had created twenty-four regional branches and established sister organizations in the United States which were designed to provide employment in various needlecrafts for Italian immigrants.

[46] Back in Italy, in 1906 Slocomb di Brazza was returning home from organizing earthquake relief in Calabria when she suffered a mental and physical breakdown in Bologna.

[52] She appeared to have improved in 1927 and returned to the Castello di Brazzà [nl], but within six months relapsed and was sent to the Hospital Villa Giuseppina in Rome, where she remained in isolation until her death at age 82 in 1944.

[17] Her defense of Barbella, which has been widely noted, along with her work in the IFI demonstrate that Slocomb di Brazza was aware of the exploitation and vulnerability garment craftswomen faced and that she was willing to use her privilege to assist them.