Hypatia Bradlaugh Bonner (31 March 1858 – 25 August 1935) was a British peace activist, teacher, author, atheist and freethinker, and the daughter of Charles Bradlaugh, a  political activist, the first openly atheist member of British Parliament and founder of the National Secular Society in 1866.
In her life she wrote important and fundamental books (
The gallows and the lash: an enquiry into the necessity for capital and corporal punishments, 1897;
Penalties upon opinion: or, some records of the laws of heresy and blasphemy; 1912;
The Christian Hell, 1913;
Christianity and conduct, or the influence of religious beliefs on morals, 1919) but is most remembered today for being the author of her father’s biography,
Charles Bradlaugh: His Life and Work.
The slave struggle in America, published around 1880, is the text version of four lectures held by Hypatia Bradlaugh Bonner about the drama of slavery in the New Continent. The lectures refer to the history of slavery in America from the time of George III to the presidency of Abraham Lincoln.