Answer the question at the end by quoting:

The Osmonds are an American family music group with a long and varied career. The Osmond Brothers began as a barbershop quartet consisting of brothers Alan, Wayne, Merrill and Jay Osmond. They were later joined by younger siblings Donny and Jimmy, both of whom enjoyed success as solo artists as well. With the addition of Donny, the group became known as The Osmonds, and enjoyed its greatest success as both a boy band and a hard rock ensemble.
Record producer Mike Curb saw the Osmonds perform as a band and recognized that they combined a rare mix of polished performing style, instrumental skill, and vocal talent. He helped the Osmonds get a record contract with MGM and arranged for them to record at Muscle Shoals with R&B producer Rick Hall. Under Hall's guidance, the Osmonds hit the top spot on the pop chart with "One Bad Apple" in 1971. The song, "One Bad Apple", written by George Jackson, who had The Jackson Five in mind when he wrote it, was originally presented to Motown Record's Chairman of the Board, Berry Gordy, for The Jackson Five to record, but he turned it down. It was then presented to MGM Records for The Osmonds; both the Jackson Five (who were admittedly inspired by The Osmonds' early success) and the Osmonds were aiming for the same Bubblegum sound and style of music, and it became their first number-one hit single, released on November 14, 1970. The Osmonds soon had hits with other light, R&B-style pop numbers like "Double Lovin'" (#14) and "Yo-Yo" (#3). In each of these hits, the formula was the same; Merrill sang lead, and Donny was "co-lead" in essence, singing the "hook" or "chorus" of the song. At this time the Osmonds also recorded several hits that were billed to Donny, the lead soloist on the songs: "Sweet and Innocent" (#7), "Go Away Little Girl" (#1), "I Knew You When" (#9) and "Puppy Love" (#2). The Osmonds were at their peak of popularity. The Osmonds began writing and performing their own music and their sound moved towards rock music beginning with their album Phase III. In addition to "Yo-Yo", Phase III produced the major hit "Down by the Lazy River" (#4). The following Crazy Horses album was the band's first really personal statement -- the brothers have been quoted as saying that the title song refers to air pollution from cars, and its instrumentation featured an even harder rock sound bordering on early heavy metal. They wrote all the songs and played all the instruments with Alan on rhythm guitar, Wayne on lead guitar, Merrill on lead vocals and bass, Jay on drums and Donny on keyboards. All the brothers sang backing vocals, with Jay and Donny sometimes singing lead parts. But Donny singing co-lead on these songs was abandoned for the reason given below (except for Lazy River, which he also did not sing co-lead on).

hat was their most popular single during this time?

), "Go Away Little Girl" (#1

Answer the question at the end by quoting:

Roberto Mangabeira Unger (; born 24 March 1947) is a philosopher and politician. He has developed his views and positions across many fields, including social, political, and economic theory. In legal theory, he is best known by his work in the 1970s and 80s while at Harvard Law School as part of the Critical Legal Studies movement, which is held to have helped disrupt the methodological consensus in American law schools. His political activity helped the transition to democracy in Brazil in the aftermath of the military regime, and culminated with his appointment as Brazil's Minister of Strategic Affairs in 2007 and again in 2015.
The beginning of Unger's academic career began with the books Knowledge and Politics and Law in Modern Society, published in 1975 and 1976 respectively. These works led to the co-founding of Critical Legal Studies (CLS) with Duncan Kennedy and Morton Horwitz. The movement stirred up controversy in legal schools across America as it challenged standard legal scholarship and made radical proposals for legal education. By the early 1980s, the CLS movement touched off a heated internal debate at Harvard, pitting the CLS scholars against the older, more traditional scholars. Throughout much of the 1980s, Unger worked on his magnum opus, Politics: A Work In Constructive Social Theory, a three volume work that assessed classical social theory and developed a political, social, and economic alternative. The series is based on the premise of society as an artifact, and rejects the necessity of certain institutional arrangements. Published in 1987, Politics was foremost a critique of contemporary social theory and politics; it developed a theory of structural and ideological change, and gave an alternative account of world history. By first attacking the idea that there is a necessary progression from one set of institutional arrangements to another, e.g. feudalism to capitalism, it then built an anti-necessitarian theory of social change, theorizing the transition from one set of institutional arrangements to another. Unger devoted much of the following decades to further elaborating on the insights developed in Politics by working out the political and social alternatives. What Should Legal Analysis Become? (Verso, 1996) developed tools to reimagine the organization of social life. Democracy Realized: The Progressive Alternative (Verso, 1998) and What Should the Left Propose? (Verso, 2005) put forth alternative institutional proposals.

What kind of book was this?
A Work In Constructive Social Theory, a three volume work that assessed classical social theory and developed a political, social, and economic alternative.