Question: Which person born on March 23, 1902 did George Roby Dempster have political battles with?

full_context: Document 1: George Dayton: George Draper Dayton (March 6, 1857 – February 18, 1938) was an American businessman and philanthropist, most famous for being the founder of Dayton's department store, which later became Target Corporation.
Document 2: Deloss Walker: Vernon Deloss Walker (August 14, 1931 – April 19, 1996) was a notable advertising executive and political campaign consultant. Walker founded the Memphis, Tennessee-based advertising firm Walker + Associates, Inc. in October 1965. Walker played a major role in politics, corporate marketing and philanthropy throughout the South from the 1960s to 1990s.
Document 3: George Weston: George Weston (March 23, 1864 – April 6, 1924) was a Canadian businessman and the founder of George Weston Limited. He became Toronto’s biggest baker with Canada’s largest bread factory. Weston began his career at the age of twelve as a baker's apprentice and went on to become a bread route salesman. By the turn of the century, he was known throughout the city for his "Weston’s Home-Made Bread" and years later for "Weston’s Biscuits." In addition to being a successful local businessman, he was also a prominent Methodist, as well as a municipal politician who served four years as alderman on Toronto City Council.
Document 4: John Walker (Arkansas politician): John Winfield Walker is an American politician and a Democratic member of the Arkansas House of Representatives representing District 34 since January 2011. John W. Walker was born in Hope, Arkansas where he attended Yerger High School until 1952. In 1965, Walker began the general practice of law in Little Rock, Arkansas with the emphasis on civil rights. In 1968, he opened one of the first three racially integrated law firms in the south, first known as Walker and Chachkin. Between 1965 and now, Walker has personally been involved in most of the reported cases which involve racial discrimination in the state of Arkansas. Many of them are landmark having created new law and opened doors to school houses and work places throughout the state of Arkansas and surrounding states. One case has continued to take his time since 1965, the Little Rock school case started by the late Wiley Branton and LDF general counsel/later Supreme Court Justice Thurgood Marshall. Many of Walker’s early cases involved classes of people discriminated against due to their race in mega corporate environments. A recent case of Walker’s was the only nationwide racial discrimination case ever successfully prosecuted against Wal-Mart. It involved a class of African American truck drivers.
Document 5: George Roby Dempster: George Roby Dempster (September 16, 1887 – September 18, 1964) was an American businessman, inventor, and politician, active primarily in Knoxville, Tennessee, during the first half of the twentieth century. Dempster is best known for the invention of the Dempster-Dumpster, a now-commonly-used trash receptacle that can be mechanically emptied into garbage trucks. During the 1910s and 1920s, the Dempster Brothers Construction Company, operated by Dempster and his brothers, built a number of roads and railroads across the Southern Appalachian region. Dempster also served as a city manager and mayor of Knoxville, where he became legendary for his political battles with eccentric Knoxville businessman Cas Walker and "Knoxville Journal" editor Guy Smith, Jr.
Document 6: T. B. Walker: Thomas Barlow Walker (February 1, 1840 – July 28, 1928) was a highly successful American businessperson who acquired timber in Minnesota and California and became an art collector. Walker founded the Minneapolis Public Library. He was among the ten wealthiest men in the world in 1923. He built two company towns, one of which his son sold to become part of what is today known as Sunkist. He is the founder and namesake of the Walker Art Center.
Document 7: Cas Walker: Orton Caswell "Cas" Walker (March 23, 1902 – September 25, 1998), was a Tennessee businessman, politician, and personality on television and radio. Walker founded a successful chain of small grocery stores that grew to include several dozen stores scattered throughout the Knoxville, Tennessee vicinity as well as parts of Virginia and Kentucky. From 1941 through 1971, Walker served on the Knoxville city council where he became legendary for his uncompromising political stances and his vehement opposition to what he claimed was a corrupt elitism in the city's government. "The Cas Walker Farm and Home Hour", a local variety show sponsored by Walker, ran in various radio and television formats between 1929 and 1983 and helped launch the careers of entertainer Dolly Parton and the Everly Brothers.
Document 8: Dallas Dempster: Dallas Reginald Dempster (born 27 August 1941) is an Australian businessman notable for original development of Perth's Burswood Resort and Casino (now Crown Perth) and the proposed Kwinana Petrochemical Plant, both of which were among the Western Australian government transactions examined by the 1990–92 WA Inc Royal Commission. In November 2013 The "West Australian" newspaper named Dempster as one of Western Australia's 100 most influential business leaders (1829–2013).
Document 9: Charlie Walker (musician): Charlie Walker (November 2, 1926 – September 12, 2008)<ref name='cmt.com/1594705'> </ref> was an American country musician born in Copeville, Texas. He held membership in the Grand Ole Opry from 1967, and was inducted into the Country Radio DJ Hall of Fame in 1981.
Document 10: Owen Robertson Cheatham: Owen Robertson Cheatham (1902-1970) was an American businessman. He founded Georgia-Pacific, a formerly publicly traded corporation on the New York Stock Exchange from 1949 to 2005, now a subsidiary of Koch Industries.
Document 11: Dempster Brothers: Dempster Brothers, Inc. of Knoxville, Tennessee, was an industrial firm that made waste handling vehicles including the Dempster Dumpmaster and Dempster Dinosaur. The firm was originally established by George Roby Dempster with his brothers Thomas and John Dempster.
Document 12: Dempster McIntosh: Dempster McIntosh was born in Newport, Rhode Island, on 17 January 1896. At age seven, his family moved to Cotuit, Massachusetts, a small fishing village on Cape Cod, where his father was a gardener on the Rothwell estate. In those preadolescent years, he worked as a laborer in the summertime and was generally known as "a jovial figure." In 1908, the McIntoshes moved to Pittsburgh, Pennsylvania, where, at the age of 15, he stopped attending school and began working. However, Cotuit historian and biographer Albert Crocker Knight, author of McIntosh's biography, "From Ocean View Avenue to Embassy Row", has often said that it was the village, with its bustling commerce, rather than Pittsburgh, that sparked Dempster's interest in business. Indeed, in an article titled by "The Barnstable Patriot", Knight was quoted as bestowing McIntosh with the title of "Cotuit's own Horatio Alger." In 1915, after having dropped out of school for some years, he completed a Money and Banking course at the University of Pittsburgh.
Document 13: George Devol: George Charles Devol Jr. (February 20, 1912 – August 11, 2011) was an American inventor known for developing Unimate, the first material handling robot employed in industrial production work.
Document 14: Bill Caswell: Bill Caswell is a country music singer-songwriter and musician active since the early 1980s. Together with his wife Rosi Caswell, the duo from Bartlesville, Oklahoma perform on rare old style instruments including the ukelin, mandolin-guitar, bell-harp, and tremeloa. In the 1980s he performed his music on television in "Hee Haw" and on live radio in "A Prairie Home Companion". The two together performed at Dollywood in Gatlinburg, Tennessee for five seasons.
Document 15: The Bailey Brothers and the Happy Valley Boys: The Bailey Brothers and the Happy Valley Boys were an American bluegrass act widely considered to be among the first to cultivate the duo harmony vocal technique widely used in modern bluegrass music today. Charlie Bailey (February 11, 1916 in Happy Valley, Tennessee, near Rogersville – March 12, 2004 in Bear, Delaware) began his musical career in 1936. His brother, Danny Bailey (December 1, 1919, Happy Valley, Tennessee – March 22, 2004, Knoxville, Tennessee), teamed up with him in 1940, and the brothers began making frequent appearances on Tennessee radio stations in the Knoxville area. Danny formed the Happy Valley Boys after Charlie joined the military in 1941. In 1944 the Happy Valley Boys relocated to Nashville, where they became members of the Grand Ole Opry, and also made regular appearances on WSM radio in Nashville. At that time, Danny was the youngest person to ever perform on the Grand Ole Opry. When Charlie returned from his military service in 1946 the brothers were reunited as a duo but only stayed in Nashville briefly before returning to radio work in Knoxville.
ground_truth: Cas Walker