Her father was Henry Philip Manus, a tobacco merchant, and her mother was Soete Vita Israël, a homemaker.

[16] As an incredibly wealthy woman, a modern-day millionaire through inheritance, Manus joined the elite ranks of female activist leadership.

Manus was devoutly loyal to the IWSA, and as its vice president, she actively resisted talk of its replacement with the World Women's Party.

Her job consisted of collecting signatures to protest war in advance of the Geneva Disarmament Conference in 1932.

[3] Later, in 1936, Manus served as secretary for the Rassemblement Universel pour la Paix (RUP) and the World Peace Congress.

Due to her work, Catholics and national socialists in the Netherlands launched a "hate-campaign" against her because she was a Jewish woman with significant political and social standing.

[31] Rosa Manus felt part of the international women's movement as evidenced from pieces of writing to Mary Sheepshanks about the publication of the feminist journal Jus Suffragii.

[33] Manus felt comfortable in her relationship with Catt, enough so that she exposed her friend to newly emerging sexual culture of European society.

[21] Sha'rawi strongly advocated for the Palestinians stating they were experiencing violence under British colonial rule while Manus and other feminists focused on the persecution of Jews during World War II.

While attending a play in London, England, Manus first encountered the plot of the Nazi regime to kill the Jewish people.

[38] In 1933, after attending the Geneva Disarmament Conference, Manus helped found and became the president of the Dutch Neutraal Vrouwencomite' voor de Vluchtelingen (Neutral Women's Committee for Refugees).

[40][41] Multiple sources suggest that she was gassed in the Nazi euthanasia mental hospital of Bernburg in 1942, but there is conflicting information around her place and date of death.

[2][42] Manus is a less well-known figure because she left few personal texts behind and she did not write a memoir like other feminists of her era.