Laidlaw gave her first speech in support of women's suffrage to an audience of friends and relatives at the age of 20. She became the secretary of the
College Equal Suffrage League in 1908 and the acting Manhattan Borough Chairperson of the
Woman Suffrage Party in 1911. The party's founder,
Carrie Chapman Catt, asked her to fill the latter position more permanently, and she did so from 1912 to 1916. In addition to her work in support of women's suffrage, Laidlaw was a crusader against
white slavery and the forced prostitution of both white and Chinese women in New York, and was a proponent of the
Mann Act of 1910. In 1912, following a violent attack on anti-prostitution activist
Rose Livingston, Laidlaw and her husband helped mobilize public opinion against the perceived inaction of
Mayor William Jay Gaynor in ordering increased police protection for activists in New York's
Chinatown. On November 9, 1912, she served as chairman of a
torchlight parade down
Fifth Avenue that drew an estimated 400,000-500,000 observers, an event that solidified her position as a leader of the suffragist movement. She wrote many articles and columns, spoke at public gatherings, and traveled around the country, including a trip through the western United States in 1913 to help organize activists. Laidlaw spoke out against the notion of
separate spheres for men and women in regards to public life, writing in 1912 that, "insofar as women were like men they ought to have the same rights; insofar as they were different they must represent themselves." In 1914, her most significant writing was published, a booklet entitled
Organizing to Win by the Political District Plan, which gave activists step-by-step instructions on how to fundraise and engage with their local political leaders to keep up sustained pressure in support of suffrage. Laidlaw became a director of the
National American Woman Suffrage Association (NAWSA) in 1917, and was among a group of leading suffragettes who met with former President
Theodore Roosevelt to persuade him to lend support to their cause. Later that year, an amendment to the
New York Constitution granting women the vote was passed. Following the ratification of the Nineteenth Amendment, Laidlaw's attention turned to international relations, and she promoted the United States' entry into the
League of Nations as well as the formation of the
United Nations. She was a strong supporter of
Prohibition and was a member of the New York State Prohibition Society. == Honors ==