American author and essayist noted for his advocacy of environmental issues and criticism of public land policies. (1927-1989).

An African-American activist who was convicted and sentenced to death for the 1981 murder of a Philadelphia police officer. His conviction was based on dubious evidence and dubious legal proceedings. ...

Democratically elected socialist president of Chile, overthrown and killed in a coup engineered by the CIA. (1908-1973).

Founder of Folkways Records. The label, founded in 1948, was instrumental in bringing folk music into the American mainstream. (1905-1986).

Israeli writer, human rights activist, and founder of the Gush Shalom peace movement. (Born 1923).

Folk singer, songwriter and activist. (Born 1941).

African American civil rights and human rights activis. (1903-1986).

Canadian auther and activist. National chairperson of the Council of Canadians, a citizens' advocacy organization, co-founder of the Blue Planet Project, and an executive member of the International F...

French writer, philosopher, feminist, and social theorist. (1908-1986).

English art critic, novelist, painter and author. (Born 1926).

American poet, peace activist, and Roman Catholic priest. (Born 1921).

Journalist, historian, media personality. (1920-2004).

Canadian Communist physician, and medical innovator who developed the first mobile blood-transfusion service in Spain in 1936. (1890-1939).

Cree leader who was involved in the North-West Resistance and subsequently imprisoned. (1825-1888).

English poet, painter, and printmaker. Considered a seminal figure in the history of both the poetry and visual arts of the Romantic Age. (1757-1827).

South American political leader who played a key role in Latin America's successful struggle for independence from Spain. (1783-1830).

German poet, playwright, theatre director, and radical. (1898-1956).

American abolitionist who advocated and practiced armed insurrection as a means to end slavery. (1800-1859).

Canadian politician, prominent member of the New Democratic Party. (1930-2003).

American stand-up comedian, writer, social critic and satirist of the 1950s and 1960s. (1925-1966).

Austrian-born Jewish philosopher best known for his philosophy of dialogue, a religious existentialism centered on the distinction between the I-Thou relationship and the I-It relationship. (1878-1965...

Trinidadian-American black leader active in the 1960s American Civil Rights Movement. (1941-1998).

English socialist poet, anthologist, early gay activist and socialist philosopher. (1844-1929).

American marine biologist and nature writer whose writings, especially 'Silent Spring', are credited with advancing the global environmental movement. (1907-1964).

Quebec union leader and activist. (1913-2010).

Mexican American farm worker, labour leader, and civil rights activist who, with Dolores Huerta, co-founded the National Farm Workers Association, which later became the United Farm Workers (UFW). (19...

American linguist, philosopher, political activist, author, and lecturer. (Born 1928).

Medical professional, gerontologist, anarchist, pacifist, conscientious objector and writer. (1920-2000).

American lawyer civil libertarian. (1857-1938).

American journalist, social activist, distributist, anarchist, and devout Catholic. (1897-1980).

French Marxist theorist, writer, filmmaker, hypergraphist and founding member of the groups Lettrist International and Situationist International. (1931-1994).

The founder of the Haudenosaunee (Iroquois) Confederacy.

American philosopher, psychologist, and educational reformer. (1859-1952).

Canadian socialist publisher, writer, and archivist.

American abolitionist, women's suffragist, editor, orator, author, statesman and reformer. (1818-1895).

American civil rights activist, Pan-Africanist, sociologist, historian, author, and editor. (1868-1963).

Canadian pacifist, feminist, social and community activist. (1908-2009).

Métis leader in what is now western Canada. (1837-1906).

Jewish-Polish political and social activist and cardiologist. (1919-2009).

German author, political theorist, philosopher, and father of communist theory, alongside Karl Marx. (1820-1895).

African former slave involved in the British movement for the abolition of the slave trade. (1745-1797).

African American civil rights activist from Mississippi, murdered in 1963. (1925-1963).

Metallurgist, humanitarian, feminist, peace activist. (Born 1921).

Brazilian educator and influential theorist of critical pedagogy. (1921-1997).

American writer, activist and feminist. (1921-2006).

Internationally renowned social psychologist, psychoanalyst, humanistic philosopher, and democratic socialist. (1900-1980).

Uruguayan journalist, writer and novelist (1940-2015). His best-known works are Las venas abiertas de América Latina (Open Veins of Latin America, 1971) and Memoria del fuego (Memory of Fire Trilogy, ...

The pre-eminent political and spritual leader of India during the Indian independence movement. (1869-1948).

American poet best known for the poem "Howl", in which he celebrates fellow members of the Beat Generation and critiques what he saw as the destructive forces of materialism and conformity in the Unit...

English journalist, political philosopher and novelist, considered one of the first exponents of utilitarianism, and one of the first modern proponents of anarchism. (1756-1836).

Anarchist known for her political activism, writing and speeches. (1869-1940).

American sociologist, poet, writer, anarchist, social critic, and public intellectual. (1911-1972).

Canadian labour leader. (1887-1918)

American paleontologist, evolutionary biologist, and historian of science. (1941-2002).

Italian Marxist philosopher, writer, politician and political theorist. (1891-1937).

American singer-songwriter and folk musician. (1912-1967).

Canadian politician and labour leader. (1885-1954).

German philosopher, one of the creators of German Idealism. (1770-1831).

French-German author, philosopher, encyclopedist and a prominent figure in the French Enlightenment. (1723-1789).

American educator, socialist and cofounder of the Highlander Folk School. (1905-1990).

Naturalist. (1769-1859).

Austrian philosopher, Roman Catholic priest and critic of the institutions of contemporary western culture. (1926-2002).

Canadian politician, journalist and clergyman. (1885-1962).

Author, urban advocate, economist, ecologist, and philosopher. (1916-2006).

A peasant girl born in what is now eastern France who claimed divine guidance, she led the French army to several important victories during the Hundred Years' War.

American author, political activist and lecturer. (1880-1968).

A Canadian academic, author, and athlete.

American biologist and sexologist. (1894-1956).

Canadian writer, social activist and feminist. (Born 1935).

Canadian journalist and author. (1909-2003).

Russian revolutionary. (1870-1924).

President of the United States during the American Civil War. (1809-1865).

Marxist revolutionary. (1871-1919).

Canadian politician and feminist. (1905-1991).

Journalist, politician, rebel. (1795-1861).

Canadian political and activist. (1890-1954).

Canadian political scientist. (1911-1987).

Writer, lecturer and broadcaster. (Born 1962).

Anti-apartheid leader, first black to be elected President of South Africa. (Born 1918).

German philosopher, political economist, historian, political theorist, sociologist, communist, and revolutionary, whose ideas are credited as the foundation of modern communism. (1818-1883).

Winner of the 1992 Nobel Peace Prize. (Born 1959).

American sociologist. (1916-1962).

Canadian anarchist and activist.

British artist, designer, author, and socialist. (1834-1896).

American historian and philosopher of technology and science. (1895-1990).

American attorney, author, lecturer, and political activist. (Born 1934).

Scottish progressive educator, author and founder of Summerhill school. (1883-1973).

U.S. protest singer (or, as he preferred, a topical singer) and songwriter who was known for his sharp wit, sardonic humor, earnest humanism, political activism, insightful and alliterative lyrics, an...

British author. (1903-1950).

German radical pacifist. (1889-1938).

Author, pamphleteer, radical, inventor, intellectual, revolutionary. (1737-1809).

African American civil rights activist. (1913-2005).

Canadian feminist, writer, and activist. (Born 1945).

Metis leader, founder of Manitoba, central figure in the North-West rebellion. (1844-1885).

Mexican artist. (1886-1957).

Musician, actor, speaker, lawyer, radical. (1898-1976).

Indian writer (in English) and activist. (Born 1961).

Philosopher, logician, mathematician, pacifist, social critic. (1872-1970).

British author, feminist and socialist campaigner. (1894-1986).

Labourers and anarchists who were tried, convicted and executed in Massachusetts in 1927.

French philosopher. (1905-1980).

German-French theologian, musician, philosopher, and physician. (1875-1965).

Political activist and writer on municipal affairs. The mayor of Toronto, Canada from 1978 to 1980. (Born 1940).

Portuguese diplomat who ignored and defied the orders of his own government for the safety of war refugees fleeing from invading German military forces in the early years of World War II. (1885-1954).

American investigative journalist. (1907-1989).

A Japanese diplomat who helped several thousand Jews leave the country by issuing transit visas to Jewish refugees so that they could travel to Japan. (1900-1986).

Canadian science broadcaster and environmental activist. (Born 1936).

Shawnee chief who attempted to form an alliance of tribes to combat American territorial ambitions and tried to rally the tribes in a common defence against the Americans. (1768-1813).

American author, historian, actor, and broadcaster. (1912-2008).

English historian, writer, socialist and peace campaigner (1924-1993).

American author and poet. (1817-1862).

Russian author. (1828-1910).

Russian revolutionary. (1879-1940).

Canadian who was sentenced to death in 1959, when he was a 14-year old student, for the allegedly murdering a classmate. (Born 1945).

South African cleric, activist and opponent of apartheid. (Born 1931).

A Swedish humanitarian who worked in Budapest, Hungary, during World War II to rescue Jews from the Holocaust. (1912-1947?)

25 September, 2015 marked four years since the passing of Kenyan environmentalist and feminist icon, Wangari Maathai. In Kenya, the celebrations were notably muted as her standing in the country has b...

Canadian political economist and activist. (Born 1932).

Winner of the 1997 Nobel Peace Prize. (Born 1950).

African-American Muslim minister, public speaker, and human rights activist. (1925-1965).

American historian, political scientist, social critic, activist and playwright. (1922-2010).