Answer the question at the end by quoting:

Swami Vivekananda (Bengali: [Sami bibekanondo] ( listen); 12 January 1863 - 4 July 1902), born Narendranath Datta (Bengali: [norendronath doto]), was an Indian Hindu monk, a chief disciple of the 19th-century Indian mystic Ramakrishna. He was a key figure in the introduction of the Indian philosophies of Vedanta and Yoga to the Western world and is credited with raising interfaith awareness, bringing Hinduism to the status of a major world religion during the late 19th century. He was a major force in the revival of Hinduism in India, and contributed to the concept of nationalism in colonial India. Vivekananda founded the Ramakrishna Math and the Ramakrishna Mission.
The ship from Europe arrived in Colombo, British Ceylon (now Sri Lanka) on 15 January 1897, and Vivekananda received a warm welcome. In Colombo he gave his first public speech in the East. From there on, his journey to Calcutta was triumphant. Vivekananda travelled from Colombo to Pamban, Rameswaram, Ramnad, Madurai, Kumbakonam and Madras, delivering lectures. Common people and rajas gave him an enthusiastic reception. During his train travels, people often sat on the rails to force the train to stop so they could hear him. From Madras, he continued his journey to Calcutta and Almora. While in the West, Vivekananda spoke about India's great spiritual heritage; in India, he repeatedly addressed social issues: uplifting the people, eliminating the caste system, promoting science and industrialisation, addressing widespread poverty and ending colonial rule. These lectures, published as Lectures from Colombo to Almora, demonstrate his nationalistic fervour and spiritual ideology. On 1 May 1897 in Calcutta, Vivekananda founded the Ramakrishna Mission for social service. Its ideals are based on Karma Yoga, and its governing body consists of the trustees of the Ramakrishna Math (which conducts religious work). Both Ramakrishna Math and Ramakrishna Mission have their headquarters at Belur Math. Vivekananda founded two other monasteries: one in Mayavati in the Himalayas (near Almora), the Advaita Ashrama and another in Madras. Two journals were founded: Prabuddha Bharata in English and Udbhodan in Bengali. That year, famine-relief work was begun by Swami Akhandananda in the Murshidabad district. Vivekananda earlier inspired Jamshedji Tata to set up a research and educational institution when they travelled together from Yokohama to Chicago on Vivekananda's first visit to the West in 1893. Tata now asked him to head his Research Institute of Science; Vivekananda declined the offer, citing a conflict with his "spiritual interests". He visited Punjab, attempting to mediate an ideological conflict between Arya Samaj (a reformist Hindu movement) and sanatan (orthodox Hindus). After brief visits to Lahore, Delhi and Khetri, Vivekananda returned to Calcutta in January 1898. He consolidated the work of the math and trained disciples for several months. Vivekananda composed "Khandana Bhava-Bandhana", a prayer song dedicated to Ramakrishna, in 1898.

Besides caste system, what is another social issue

promoting science and industrialisation,

Answer the question at the end by quoting:

Hardy Rodenstock (born December 7, 1941 in Marienwerder (Kwidzyn), legal name Meinhard Gorke ) is a former publisher and manager of pop and Schlager music in Germany and is a prominent wine collector, connoisseur, and trader, with a special interest in old and rare wines. He became famous for his allegedly uncanny ability to track down old and very rare wines, and for arranging extravagant wine tastings featuring these wines. It has been alleged that Rodenstock is the perpetrator of an elaborate wine fraud. In 1992, a German court found that Rodenstock had "knowingly offered adulterated wine" for sale.
In May 2008, a book about the controversy was published under the title The Billionaire's Vinegar, written by Benjamin Wallace. In the book a tritium test and two carbon-14 tests date the wine circa 1962. Later, a cesium-137 test gave similar results. Rodenstock was not available for comments on the publication of the book. Auctioneer Michael Broadbent, on the other hand, was unhappy with how his relationship to Rodenstock was portrayed in the book. In July 2009 it was announced that Michael Broadbent would sue Random House, the publishers of The Billionaire's Vinegar, for libel and defamation of character, on claims that the book made allegations that suggested that Broadbent had behaved in an unprofessional manner in the way in which he had auctioned some of these bottles and that his relationship and dealings with Hardy Rodenstock was suspected of being improper. The suit was filed in the United Kingdom, whose libel laws are favorable to the plaintiff. Unlike U.S. law, in English defamation law even true allegations can be defamatory. Random House initially stated it did not believe it had defamed Broadbent and would defend the lawsuit. In October 2009, Random House, avoiding trial, entered into a settlement agreement with Broadbent. In a statement read out in open court, Random House apologised unreservedly for making the allegations, and accepted that they were untrue. It gave an undertaking not to repeat the allegations and paid Broadbent undisclosed damages. It removed the book from sale in the United Kingdom. It also was reported that Wallace was not a party to the lawsuit or settlement, that Random House would be making no changes to the book, and that it would continue to publish the book in all territories except the UK. The film rights to The Billionaire's Vinegar have been purchased by a Hollywood consortium, while HBO simultaneously had bought the film rights to the corresponding The New Yorker article.

Why did he choose to sue?
on claims that the book made allegations that suggested that Broadbent had behaved in an unprofessional manner in the way in which he had auctioned some of these bottles