Question: What Georgian-born dictator did Georgy Flyorov direct a letter to?

Context paragraphs:
Georgy Flyorov: Georgy Nikolayevich Flyorov (Russian: Гео́ргий Никола́евич Флёров ; ] ; 2 March 1913 – 19 November 1990), was a Russian physicist who is known for his discovery of the spontaneous fission and his contribution towards the physics of thermal reactions.  In addition, he is also known for his letter directed to Joseph Stalin, during the midst of World War II, to start the atomic bomb project in the Soviet Union.

Letter from Birmingham Jail: The Letter from Birmingham Jail, also known as the Letter from Birmingham City Jail and The Negro Is Your Brother, is an open letter written on April 16, 1963, by Martin Luther King Jr. The letter defends the strategy of nonviolent resistance to racism.  It says that people have a moral responsibility to break unjust laws and to take direct action rather than waiting potentially forever for justice to come through the courts.  Responding to being referred to as an "outsider," King writes, "Injustice anywhere is a threat to justice everywhere".

Joseph Stalin: Joseph Vissarionovich Stalin (18 December 1878 – 5 March 1953) was a Georgian-born Soviet revolutionary and political leader.  Governing the Soviet Union as its dictator from the mid-1920s until his death in 1953, he served as General Secretary of the Central Committee of the Communist Party of the Soviet Union from 1922 to 1952 and as Premier of the Soviet Union from 1941 to 1953.  Ideologically a Marxist and a Leninist, Stalin helped to formalise these ideas as Marxism–Leninism while his own policies became known as Stalinism.

Flerovium: Flerovium is a superheavy artificial chemical element with symbol Fl and atomic number 114.  It is an extremely radioactive synthetic element.  The element is named after the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research in Dubna, Russia, where the element was discovered in 1998.  The name of the laboratory, in turn, honours the Russian physicist Georgy Flyorov (Флёров in Cyrillic, hence the transliteration of "yo" to "e").  The name was adopted by IUPAC on 30 May 2012.

Open Christmas Letter: The Open Christmas Letter was a public message for peace addressed "To the Women of Germany and Austria", signed by a group of 101 British women suffragists at the end of 1914 as the first Christmas of World War I approached.  The Open Christmas Letter was written in acknowledgment of the mounting horror of modern war and as a direct response to letters written to American feminist Carrie Chapman Catt, the president of the International Woman Suffrage Alliance (IWSA), by a small group of German women's rights activists.  Published in January 1915 in "Jus Suffragii", the journal of the IWSA, the Open Christmas Letter was answered two months later by a group of 155 prominent German and Austrian women who were pacifists.  The exchange of letters between women of nations at war helped promote the aims of peace, and helped prevent the fracturing of the unity which lay in the common goal they shared: suffrage for women.

Sales letter: A sales letter is a piece of direct mail which is designed to persuade the reader to purchase a particular product or service in the absence of a salesman.  It has been defined as "A form of direct mail in which an advertiser sends a letter to a potential customer."  It is distinct from other direct mail techniques, such as the distribution of leaflets and catalogues, as the sales letter typically sells a single product or product line, and further tends to be mainly textual as opposed to graphics-based.  It is typically used for products or services which, due to their price, are a considered purchase at medium or high value (typically tens to thousands of dollars).  A sales letter is often, but not exclusively, the last stage of the sales process before the customer places an order, and is designed to ensure that the prospect is committed to becoming a customer.

Igor Kurchatov: Igor Vasilyevich Kurchatov (Russian: И́горь Васи́льевич Курча́тов ; 8(21) January 1903 – 7 February 1960), was a Soviet nuclear physicist who is widely known as the director of the Soviet atomic bomb project.  Along with Georgy Flyorov and Andrei Sakharov, Kurchatov is widely remembered and dubbed as the "father of the Soviet atomic bomb" and later, "the father of the Soviet Nuclear Missile" for his directorial role in the development of the Soviet nuclear program, in a clandestine program during World War II formed in the wake of the USSR's discovery of the Western Allied efforts to develop nuclear weapons.  After nine years of covert development, the Soviet Union successfully tested its first nuclear weapon, codenamed "First Lightning" at the Semipalatinsk Test Range in 1949.  In 1954 he was awarded the USSR State Prize in physics.

Telecom dispute between Gibraltar and Spain: Direct telephone connections between Gibraltar and Spain were severed in 1969, when land communications between both territories were halted by the Spanish dictator Francisco Franco, and were not restored until 1986.  However, Gibraltar experienced restrictions after that date causing problems with its telecommunications system, as a direct result of the Spanish sovereignty claim.

Konstantin Petrzhak: Konstantin Petrzhak (alternatively Pietrzak; Russian: Константи́н Анто́нович Петржак ; ] ; 1907–1998) was a Soviet–Russian nuclear physicist and university professor of Polish origin.  He discovered spontaneous fission of uranium with Georgy Flyorov in 1940; in addition, he also aided in Soviet Union's atomic bomb project .

Business letter: A business letter is usually a letter from one company to another, or between such organizations and their customers, clients and other external parties.  The overall style of letter depends on the relationship between the parties concerned.  Business letters can have many types of contents, for example to request direct information or action from another party, to order supplies from a supplier, to point out a mistake by the letter's recipient, to reply directly to a request, to apologize for a wrong, or to convey goodwill.  A business letter is sometimes useful because it produces a permanent written record, and may be taken more seriously by the recipient than other forms of communication.

Supporting paragraphs: Georgy Flyorov Joseph Stalin
Answer: Joseph Stalin