Question: What band is the sister act of the singers of "One Nation Under a Groove"? 

Context articles: Sister Act 2: Back in the Habit
Bop Gun (One Nation)
Peter Prenzler
Pauline Hanson's One Nation
One Nation Under a Groove (song)
Jack Paff
Parliament-Funkadelic: One Nation Under a Groove
One Nation NSW
Funkadelic
One Nation Labour

Sister Act 2: Back in the Habit is a 1993 American musical comedy film loosely based on the life of Crenshaw High School choir instructor Iris Stevenson, and starring Whoopi Goldberg.
 Directed by Bill Duke, and released by Touchstone Pictures, it is the sequel to the successful 1992 film "Sister Act".
 Most of the original cast reprise their roles in the sequel, including Maggie Smith, Kathy Najimy, Wendy Makkena, and Mary Wickes.
"Bop Gun (One Nation)" is the third single from Ice Cube's fourth album, "Lethal Injection".
 It samples the Funkadelic song "One Nation Under a Groove".
 It reached number 6 on the Hot Rap Singles chart and number 23 on the Billboard Pop Singles chart.
Peter Ross Prenzler (born 3 April 1952) is a former Australian politician.
 Born in Boonah, he served in the Royal Australian Artillery and the Citizens Military Force 1969–1971.
 He was a veterinary surgeon at Kalbar before entering politics.
 In 1998, he was elected to the Legislative Assembly of Queensland as a member of Pauline Hanson's One Nation, representing the seat of Lockyer.
 He remained in the party until December 1999, when he and the other One Nation MPs left the party to form the City Country Alliance, of which Prenzler became deputy leader.
 In addition to the deputy leadership, he held the position of spokesperson for Health, Primary Industries, Aboriginal and Torres Strait Islander Policy, Natural Resources, Environment and Heritage, Fair Trading and Women's Policy.
 He contested the 2001 state election but was defeated by One Nation candidate Bill Flynn.
Pauline Hanson's One Nation (PHON or ONP, also One Nation or One Nation Party) is a nationalist, right-wing populist party in Australia.
 One Nation was founded in 1997, by then-member of parliament Pauline Hanson and her advisors David Ettridge and David Oldfield after Hanson was disendorsed as a federal candidate for the Liberal Party of Australia.
 The disendorsement came before the 1996 federal election because of comments she made about Indigenous Australians.
 Hanson sat as an independent for one year before forming One Nation.
"One Nation Under a Groove" is a 1978 song by Funkadelic, the title track from their album of the same name, The lyrics refer to dancing as a way to freedom.
 Compared to Funkadelic's earlier output, that was characterized by sound typical for rock music, this song has sound more typical for dance music.
 The 12" single of the song is an extension of the album track (this version has yet to be made available on CD).
Jack Kelvin Paff (born 11 May 1938) is a former Australian politician.
 Born in Taree, New South Wales, he served in the Citizens Military Force and rose to the position of sergeant.
 Before entering politics, he was a stationmaster with New South Wales Railways and then served in the Queensland Police Force.
 In 1998, he was elected to the Legislative Assembly of Queensland as a member of Pauline Hanson's One Nation, representing the seat of Ipswich West.
 He remained in One Nation until December 1999, when he and the other One Nation MPs left the party to form the City Country Alliance under the leadership of Bill Feldman.
 Paff continued as party whip for the new grouping, and was the spokesperson for Law (Attorney-General), Justice and the Arts, Communication and Information, Local Government and Planning, Regional and Rural Communities, State Development and Trade.
 He was defeated in 2001 by Labor's Don Livingstone, whom Paff had defeated in 1998.
Parliament-Funkadelic: One Nation Under A Groove is a documentary broadcast in the USA on PBS in October 2005 as part of the "Independent Lens" series.
 The documentary chronicles the development of the Parliament-Funkadelic musical collective, led by the producer, writer and arranger George Clinton.
 "Parliament-Funkadelic: One Nation Under A Groove" was developed by Brazen Hussy Productions, based in New York City and led by director Yvonne Smith.
One Nation NSW was a minor Australian political party, which operated exclusively in the state of New South Wales (NSW), in the early 2000's.
 The party was a splinter group of Pauline Hanson’s One Nation (PHON).
 It was a socially conservative populist party on the right of the political spectrum and its policies were similar to that of the original One Nation party, advocating reduced immigration levels, an end to Australia’s policy of multiculturalism and an end to what it perceives to be overly favourable treatment of Australian indigenous Aboriginal population.
Funkadelic is an American band that was most prominent during the 1970s.
 The band and its sister act Parliament, both led by George Clinton, pioneered the funk music culture of that decade.
One Nation Labour refers to the theme and branding of the British Labour Party adopted by the party in 2012 under the leadership of Ed Miliband.
 Miliband described the "One Nation" term as being related to British Conservative Prime Minister Benjamin Disraeli's idea of One Nation conservatism.
 Disraeli claimed a need for government to reduce economic inequality, which he believed was splitting Britain into two nations of rich and poor people.
 Miliband stated that the theme of One Nation was shared by Labour Prime Minister Clement Attlee.
 Miliband has declared inspiration from Disraeli's and Attlee's One Nation theme, in that it challenges social barriers of class and promotes the unity of Britain.