Answer the question at the end by quoting:

Marian Anderson (February 27, 1897 - April 8, 1993) was an African-American contralto and one of the most celebrated singers of the twentieth century. Music critic Alan Blyth said: "Her voice was a rich, vibrant contralto of intrinsic beauty." Most of her singing career was spent performing in concert and recital in major music venues and with famous orchestras throughout the United States and Europe between 1925 and 1965. Although offered roles with many important European opera companies, Anderson declined, as she had no training in acting.
In 1933, Anderson made her European debut in a concert at Wigmore Hall in London, where she was received enthusiastically. She spent the early 1930s touring throughout Europe where she did not encounter the racial prejudices she had experienced in America. In the summer of 1930, she went to Scandinavia, where she met the Finnish pianist Kosti Vehanen who became her regular accompanist and her vocal coach for many years. She also met Jean Sibelius through Vehanen after he had heard her in a concert in Helsinki. Moved by her performance, Sibelius invited them to his home and asked his wife to bring champagne in place of the traditional coffee. Sibelius commented to Anderson of her performance that he felt that she had been able to penetrate the Nordic soul. The two struck up an immediate friendship, which further blossomed into a professional partnership, and for many years Sibelius altered and composed songs for Anderson to perform. He created a new arrangement of the song "Solitude" and dedicated it to Anderson in 1939. Originally The Jewish Girl's Song from his 1906 incidental music to Belshazzar's Feast, it later became the "Solitude" section of the orchestral suite derived from the incidental music.  In 1934, impresario Sol Hurok offered Anderson a better contract than she previously had with Arthur Judson. He became her manager for the rest of her performing career and through his persuasion she came back to perform in America. In 1935, Anderson made her first recital appearance in New York at Town Hall, which received highly favorable reviews by music critics. She spent the next four years touring throughout the United States and Europe. She was offered opera roles by several European houses but, due to her lack of acting experience, Anderson declined all of those offers. She did, however, record a number of opera arias in the studio, which became bestsellers.  Anderson, accompanied by Vehanen, continued to tour throughout Europe during the mid-1930s. She visited Eastern European capitals and Russia and returned again to Scandinavia, where "Marian fever" had spread to small towns and villages where she had thousands of fans. She quickly became a favorite of many conductors and composers of major European orchestras. During a 1935 tour in Salzburg, the conductor Arturo Toscanini told her she had a voice "heard once in a hundred years".  In the late 1930s, Anderson gave about 70 recitals a year in the United States. Although by then quite famous, her stature did not completely end the prejudice she confronted as a young black singer touring the United States. She was still denied rooms in certain American hotels and was not allowed to eat in certain American restaurants. Because of this discrimination, Albert Einstein, a champion of racial tolerance, hosted Anderson on many occasions, the first being in 1937 when she was denied a hotel before performing at Princeton University. She last stayed with him months before he died in 1955.

Was there ever any conflicts?

her stature did not completely end the prejudice she confronted as a young black singer touring the United States.



Answer the question at the end by quoting:

Robert Swan Mueller III (; born August 7, 1944) is an American attorney who served as the sixth Director of the Federal Bureau of Investigation from 2001 to 2013. A Republican, he was appointed by President George W. Bush; President Barack Obama gave his original ten-year term a two-year extension, making him the longest-serving FBI director since J. Edgar Hoover. He is currently head of the Special Counsel investigation of Russian interference in the 2016 United States elections and related matters. A graduate of Princeton University, Mueller served as a Marine Corps officer during the Vietnam War, receiving the Bronze Star Medal with Combat "V" for heroism and the Purple Heart Medal.
After receiving his J.D. degree in 1973 from the University of Virginia School of Law, Mueller worked as a litigator at the firm Pillsbury, Madison and Sutro in San Francisco until 1976. He then served for 12 years in United States Attorney offices. He first worked in the office of the U.S. Attorney for the Northern District of California in San Francisco, where he rose to be chief of the criminal division, and in 1982, he moved to Boston to work in the office of the U.S. Attorney's Office for the District of Massachusetts as Assistant United States Attorney, where he investigated and prosecuted major financial fraud, terrorism and public corruption cases, as well as narcotics conspiracies and international money launderers.  After serving as a partner at the Boston law firm of Hill and Barlow, Mueller returned to government service. In 1989, he served in the United States Department of Justice as an assistant to Attorney General Dick Thornburgh and as acting deputy Attorney General. James Baker, with whom he worked on national security matters, said he had "...an appreciation for the Constitution and the rule of law." The following year he took charge of its criminal division. During his tenure, he oversaw prosecutions including that of Panamanian leader Manuel Noriega, the Pan Am Flight 103 (Lockerbie bombing) case, and of the Gambino crime family boss John Gotti. In 1991, he was elected a fellow of the American College of Trial Lawyers.  In 1993, Mueller became a partner at Boston's Hale and Dorr, specializing in white-collar crime litigation. He returned to public service in 1995 as senior litigator in the homicide section of the District of Columbia United States Attorney's Office. In 1998, Mueller was named U.S. Attorney for the Northern District of California and held that position until 2001.

What cases did he oversee?
he oversaw prosecutions including that of Panamanian leader Manuel Noriega, the Pan Am Flight 103 (Lockerbie bombing) case, and of the Gambino crime family boss John Gotti.