[5] Simons was the translator of several books by German-speaking European Marxists, including Wilhelm Liebknecht and Karl Kautsky.

It was organized by the Socialist Party of the United States’ newly formed Woman’s National Committee to celebrate the political rights of women.

Simons resigned from the Woman’s National Committee in 1914 because of the lack of care for women’s issues by the Socialist party.

"[6] Having played a key role in the founding of an annual Women's Day celebration in the USA in 1909, in 1910, Simons was an "American delegate to the International Socialist Congress at Copenhagen, where Clara Zetkin was inspired to create a similar celebration in Germany and Austria, founding International Women’s Day the next year, in 1911.

German delegates Zetkin, Käte Duncker "and other comrades" submitted the following resolution to the Congress: "On occasion of the annual May demonstration [...] the request of full political equality of the sexes must be proclaimed and substantiated.