Question: Marguerite McNulty, who was regularly referred to in press as a “beauty”, was a U.S. stage actress, McNulty’s true name was Katya Minasian, which came to light when it was nationally reported in late 1925 that she had filed suit against the scion William Andrews Clark III, the third grandson of the then very recently late railroad and mining magnate, financier, and U.S. Senator of Montana, and entrepreneur, involved with mining, banking, and railroads?
Context: The Los Angeles and Salt Lake Railroad (reporting mark SLR) was a rail company that completed and operated a railway line between its namesake cities, via Las Vegas, Nevada.  Incorporated in Utah in 1901 as the San Pedro, Los Angeles and Salt Lake Railroad, the line was largely the brainchild of William Andrews Clark, a Montana mining baron and United States Senator.  Clark enlisted the help of Utah's U.S. Senator Thomas Kearns, mining magnate and newspaper man, to ensure the success of the line through Utah.  Construction of the railroad's main line was completed in 1905.  Company shareholders adopted the LA&SL name in 1916.  The railway was also known by its official nickname, "The Salt Lake Route", and was sometimes informally referred to as "The Clark Road".  The tracks are still in use by the modern Union Pacific Railroad, as the Caliente, Sharp, and Lynndyl Subdivisions. Francis McNulty, Jr. was a Republican member of the Iowa House of Representatives from 1896 to 1898.  Originally from Michigan where he graduated from the University of Michigan Law School at Ann Arbor, Michigan, McNulty removed to Sioux City, Iowa where he practiced law and served as a state representative in the Iowa General Assembly.  He represented District 58 in Woodbury County, Iowa.  Not a year after his term of office ended, after gold was discovered in Nome, Alaska (Cape Nome) in 1899, McNulty moved there.  He practiced law in Nome, arguing cases before the United States District Court of the Territory of Alaska (Est. 1884).  At least one of his successfully argued cases is published.  In 1904, Republican Philander C. Knox, United States Attorney General in the Cabinets of both U.S. Presidents William McKinley and Theodore Roosevelt, and the 7 term U.S. Senator from Iowa (prior having served four terms as a U.S. Representative from the state) Republican William B. Allison both endorsed McNulty for appointment as U.S. Attorney for the District of Alaska.  The position had been recently vacated by Marvin Grisby. Lina Joy is a Malay convert from Islam to Christianity.  Born Azlina Jailani on 28 July 1964 in Malaysia to Muslim parents of Javanese descent, she converted at age 26.  The Lina Joy case sparkled a debate about apostasy in Malaysia, and is there sometimes referred to as a landmark case.  In 1998, she was baptised, and applied to have her conversion legally recognised by the Malaysian courts.  Though her change of name was recognised in 1999 and so noted on her identity card, her change of religion was not (for lack of a Mahkamah Syariah confirmation document); for this reason, she filed suit with the High Court in 1999, bypassing the Syariah Court (Islamic court).  She later filed suit with the Federal Court in 2006.  Joy hopes to live openly as a Christian; she was forced to go into hiding by the publicity surrounding her case. William Andrews Clark Jr. (March 29, 1877 – June 14, 1934) was a Los Angeles-based philanthropist and the youngest surviving son of copper baron and U.S. Senator William Andrews Clark Sr. and his first wife, Katherine. John J. McNulty, Jr. ("Jack" or "Big Jack") (1922–2009) was a Northern New York State, U.S.A. political power broker, who held a series of local political offices in Albany County, New York from 1949 and in 6 ensuing decades until the year 2002 and whose crowning political achievement was succeeding at having his son Michael R. McNulty elected to several successive terms as a United States Congressman.  Jack McNulty is said to have been a "co-congressman" for the 2 decades that his son served in the U.S. Congress, before his retirement from the U.S. House of Representatives in 2008.  A fellow Democrat, Jack was a staunch opponent of the entrenched old guard Albany County Democratic political machine Democratic Party (U.S.A.), which was run by Dan O’Connell and which in a political in-fight had unseated his father John J. McNulty, Sr. as Sheriff of Albany County, New York back in 1937.  The high point of Jack's personal political career was when he recaptured that Sheriff's office, being, himself, elected Sheriff of the County of Albany, New York in 1973.  In later life, Jack was a beloved and respected elder statesman of Northern New York State.  The mention of his name at a year 2000 Democratic convention at the Times Union Center caused the full arena crowd of 11,000 people to rise in a spontaneous standing ovation.  "Jack McNulty's word was his bond."  – Democratic New York State Senator Neil Breslin, "For being 87, Jack knew how to change with the time.  Jack connected to people in their 20s."  – Albany County Democratic Chairman Dan McCoy, "the man I often introduced at Democratic Party events as the greatest Democrat I know."  – Rensselaer County Democratic Chairman Thomas Wade The Melodeon (accordion) playing vaudevillian Ann “Ma” McNulty (1887–1970), widowed in 1928 in the wake of the Great Depression and determined to support and keep together the small remaining family of herself and her 2 minor children, went to stage with these children, who were Eileen McNulty (1915–1989), a songstress and dancer, and Peter McNulty (1917–1960), a singer, dancer, violinist, pianist and, eventually, a composer of music and lyrics.  The trio, who were known as the "“The McNulty Family’s Irish Showboat Revue”", first appeared on stage as such in 1932-1933 and through Ma’s astute show business acumen became almost immediately and remained for decades an astounding success on the U.S. East Coast entertainment circuit.  The trio eventually appeared regularly on radio and at such venues as the Rockefeller Center's Radio City Music Hall, the Yorkville Casino, New York City’s Leitrim House and at Rockaway Beach, Queens.  For 16 consecutive years the trio of "Ma" McNulty, Eileen McNulty and Peter McNulty sold out the Brooklyn Academy of Music’s 2,109 seat Howard Gillman Opera House.  In their near 2 decades of music recording for labels like Decca Records, Standard and Copley from 1938-1956, the McNulty family’s "“Showboat Revue”" released 155 sides on 78-rpm shellac & vinyl.  In 1953, they appeared through the then new entertainment venue of television on Milton Berle’s wildly popular Texaco Star Theater. William Andrews Clark Sr. (January 8, 1839March 2, 1925) was an American politician and entrepreneur, involved with mining, banking, and railroads. Marguerite McNulty (fl.  c. 1920), who was regularly referred to in press as a “beauty”, was a U.S. stage actress.  For decades in the early 20th century, she was cast in musical and other comedy productions on Broadway theatre, like the musical comedy "Fifty Fifty, Ltd." (1919) and the Broadway farce "The High Hatters" (1928).  McNulty was also cast in a single silent film, 1925’s Ermine and Rhinestones.  The daughter of an Armenian immigrant, McNulty’s true name was Katya Minasian, which came to light when it was nationally reported in late 1925 that she had filed suit against the scion William Andrews Clark III, the third grandson of the then very recently late railroad and mining magnate, financier, and U.S. Senator William A. Clark of Montana.  McNulty’s claim against the younger Clark was for his allegedly having breached his promise to marry her.  For several years prior, McNulty had a romantic relationship with Clark III, which his family worked hard to, eventually, successfully discourage.  The enduring fame of “Marguerite McNulty” seems to arise solely from the wide national publicity given the lawsuit. The Copper King Mansion, also known as the W. A. Clark Mansion, is a 34-room residence of Romanesque Revival Victorian architecture that was built from 1884 to 1888 as the Butte, Montana, residence of William Andrews Clark, one of Montana's three famous Copper Kings.  The home features fresco painted ceilings, elegant parquets of rare imported wood, gas and electric chandeliers, ornate hand-carved fireplaces and stairways, and stained-glass windows.  The mansion was added to the National Register of Historic Places in 1970. Vanessa Gounden (born 1961) is South Africa's first female mining magnate and arguably most successful female entrepreneur, whose business interest span healthcare services, financial services and lifestyle and leisure.  She served in Nelson Mandela's ANC administration during the 1990s.  She is South Africa's first female mining magnate and one of South Africa's most successful female entrepreneurs.  Vanessa Gounden is an inspirational and driven businesswoman who has made a name for herself in notoriously difficult industries as diverse as mining to fashion.
Answer: William A. Clark