Arthur Rae (14 March 1860 – 25 November 1943) was a New Zealand-born Australian politician.
 Born in Christchurch to Charles and Ann Rae (née Beldam), he received a primary education at Blenheim before migrating to Australia in 1878, where he became a miner, shearer and journalist.
 He was secretary of the New South Wales Shearers' Union during the 1890 strike.
 He also served as Vice-President, President and Honorary-General Secretary of the Australian Workers' Union.
 In 1891, he was elected to the New South Wales Legislative Assembly as one of the three members for Murrumbidgee, leaving the Assembly in 1894.
 In 1910, Rae was elected to the Australian Senate as a Labor Senator from New South Wales.
 He held the seat until his defeat in 1914.
 He returned to the Senate, after a break of over ten years, in 1929 (elected in 1928).
 After the Labor split of 1931, Rae joined the Lang Labor group, but was defeated as a Lang Labor candidate in 1934.
 Rae died in 1943.
Alzina Stevens ("née" Parsons; May 27, 1849 – June 3, 1900) was an American labor leader, industrial reformer, journalist, and suffragist from Maine, active in Hull House.
 She was one of the representative women in the order of the Knights of Labor, and her history was, in some of its phases, a cornerstone of woman's work in the U.S. labor movement in the last decades of the 19th century.
 Stevens was an ardent advocate of equal suffrage.
 For several years, she served on the editorial staff of the "Toledo Bee"; she was also half owner and editor of the "Vanguard", an organ of the People's Party.
Sergei Egorovich Shevitch (spelled variously, c. 1847-1911) ( Сергей Егорович Шевич) was a Russian newspaper editor and socialist political activist who achieved his greatest fame in the United States of America.
 As editor of the "New Yorker Volkszeitung" (New York People's News) from 1879 to 1890, Shevitch emerged as arguably the most important leader of the Socialist Labor Party of America.
 In 1889, Shevitch was the leader of a split of the Socialist Labor Party of America, emerging victorious and serving for a short while as the National Secretary of the organization.
Knights of Labor (K of L), officially Noble and Holy Order of the Knights of Labor, was the largest and one of the most important American labor organizations of the 1880s.
 Its most important leader was Terence V. Powderly.
 The Knights promoted the social and cultural uplift of the workingman, rejected socialism and anarchism, demanded the eight-hour day, and promoted the producers ethic of republicanism.
 In some cases it acted as a labor union, negotiating with employers, but it was never well organized, and after a rapid expansion in the mid-1880s, it suddenly lost its new members and became a small operation again.
Ian Neal Stevens (born 13 April 1948) is a former New Zealand rugby union player.
 A halfback and first five-eighth, Stevens represented Wellington at a provincial level, and was a member of the New Zealand national side, the All Blacks, from 1972 to 1976.
 He played 33 games for the All Blacks, including one as captain, and appeared in three test matches.
Fumitoshi Oizaki (追崎 史敏 , Oizaki Fumitoshi ) (born October 15, 1975) is a Japanese anime director, character designer, and animator.
 He is primarily associated with Gonzo, which produced his series directorial debut, "Romeo x Juliet", and with Sunrise, where he serves as series character designer of the "Sgt. Frog" franchise.
 He is a member of the Japan Animation Creators Association (JAniCA) labor group.
Patrick Frederick Mooney (17 January 1880 – 23 December 1942) was an Australian politician.
 Born in Eurobodalla, New South Wales, he received a primary education before becoming a hotel manager and tram driver.
 He was an official with the Tramway Workers Union, and also served on Redfern Council, rising to be mayor in 1925.
 On 23 December 1931, New South Wales Premier Jack Lang installed Mooney as a Lang Labor member in a Senate vacancy that resulted from the death of Nationalist Senator Walter Duncan.
 Mooney's time in the Senate was short as the 1931 election had passed and Duncan's term was due to expire on 30 June 1932.
 He contested the 1934 election as a Lang Labor candidate but was unsuccessful.
 He remained an organiser of the Lang Labor group and a Redfern Alderman.
 Mooney died in 1942.
The Partido Lakas ng Masa (PLM; Party of the Laboring Masses) is a socialist party in the Philippines.
 Created in 2009, it includes as its affiliate the labor group Bukluran ng Manggagawang Pilipino, and is Sanlakas' political party for purposes of contesting non-party-list elections.
 It is the umbrella group of various organizations such as Zone One Tondo Organization (ZOTO) and Kongreso ng Pagkakaisa ng Maralita ng Lungsod (KPML).
The Independent Labor Group was a minor Australian political grouping in the New South Wales Legislative Council from 1959 to 1977.
 The group emerged when a number of Labor Party MLCs were expelled from the party for voting against the abolition of the Legislative Council, which was then party policy.
James Patrick Digger Dunn (20 August 1887 – 21 November 1945) was an English-born Australian politician.
 Born in Liverpool, he received a primary education before migrating to Australia in 1903, where he became a miner and shearer.
 He was an organiser with the Australian Workers' Union and the Sydney Vice-President of the Iron Trades Federation.
 He served in the military 1915-1919.
 In 1928, he was elected to the Australian Senate for New South Wales, as a member of the Labor Party.
 In the 1931 Labor split, Dunn joined the Lang Labor group.
 He contested the 1934 election under this heading but was defeated.
 He died in 1945.

Question: Who was the most important leader of the labor group that Alzina Stevens represented?
Answer: Terence V. Powderly