[3] He spent his early years in the US, moving with his family from New York to Ohio, to Wisconsin, and finally to Minnesota, where he settled with his wife, Almyra "Myra" Doan, whom he had married in 1878 and with whom he had two sons.

[3] On October 15, 1890, Kingsley was setting brakes on the Northern Pacific line at Spring Gulch, located near Missoula, Montana.

[5] After his convalescence, Kingsley divorced and moved to San Francisco, where he quickly became the state organizer for the Socialist Labor Party of America.

[10] It declared that "the pathway leading to our emancipation from the chains of wage slavery is uncompromising political warfare against the capitalist class, with no quarter and no surrender.

[11] Fundamental restructuring of society was necessary to redistribute wealth, according to this theory, with the workers rising to power through political organization, education and propaganda.

[13] He held executive positions, spoke widely, and served as editor of the SPC's flagship publication, Western Clarion, which he also helped to finance, from 1903 until 1908, and briefly in 1912.

He ran as a Socialist Party of Canada candidate for the British Columbia Legislative Assembly in the multiple-member Vancouver City riding in the 1907 and 1909 provincial elections as well as a 1909 by-election.