Question: What was the official communication including over 100 emails which contained classified information which was investigated by the 7th director of the Federal Bureau of Investigation?

full_context: Document 1: United States Senate career of Hillary Clinton: Hillary Rodham Clinton served as a United States Senator from New York from January 3, 2001 to January 21, 2009. She won the United States Senate election in New York, 2000 and the United States Senate election in New York, 2006. Clinton resigned from the Senate on January 21, 2009 to become United States Secretary of State for the Obama Administration.
Document 2: Jack Ryan (FBI agent): John C. "Jack" Ryan (born 19 June 1938) is a former FBI agent and police officer. He had been an FBI agent between 1966 and 1987 before being fired for refusing to investigate nonviolent activists. He lost his job in September 1987 ten months short of retirement. He was thus ineligible for a full pension and had to live in a homeless shelter. In a report by the "LA Times", he stated his belief that the Bureau could reinstate him to a position which would not conflict with his personal beliefs that U.S. involvement in Central America is "violent, illegal and immoral."
Document 3: Michael Flynn: Michael Thomas "Mike" Flynn (born December 1958) is a retired United States Army Lieutenant General, who served in the Army for 33 years until 2014. Flynn's military career included a key role in shaping U.S. counterterrorism strategy and dismantling insurgent networks in Afghanistan and Iraq, and he was given numerous combat arms, conventional, and special operations senior intelligence assignments. He was appointed by President Barack Obama as the eighteenth director of the Defense Intelligence Agency, serving from July 2012 to his retirement from the military in August 2014. After leaving the military, he established Flynn Intel Group which has provided intelligence services for businesses and governments, including ones in Turkey. Flynn also briefly served as the twenty-fifth National Security Advisor for President Donald Trump, from January 20 to February 13, 2017.
Document 4: Hillary Clinton: Hillary Diane Rodham Clinton ( ; born October 26, 1947) is an American politician who was the First Lady of the United States from 1993 to 2001, U.S. Senator from New York from 2001 to 2009, 67th United States Secretary of State from 2009 to 2013, and the Democratic Party's nominee for President of the United States in the 2016 election.
Document 5: Hillary Clinton email controversy: In March 2015, it became publicly known that Hillary Clinton, during her tenure as United States Secretary of State, had used her family's private email server for official communications, rather than official State Department email accounts maintained on federal secure servers. Those official communications included over 100 emails which contained classified information at the time they were sent, as well as nearly 2,100 emails which were not marked classified but would retroactively be ranked as classified by the State Department.
Document 6: Huma Abedin: Huma Mahmood Abedin (born July 28, 1976) is an American political staffer who was vice chair of Hillary Clinton's 2016 campaign for President of the United States. Prior to that, Abedin was deputy chief of staff to Clinton, who was U.S. Secretary of State, from 2009 to 2013. She was also the traveling chief of staff and former assistant for Clinton during Clinton's campaign for the Democratic nomination in the 2008 presidential election.
Document 7: Bush White House email controversy: During the 2007 Congressional investigation of the dismissal of eight U.S. attorneys, it was discovered that administration officials had been using a private Internet domain, called gwb43.com, owned by and hosted on an email server run by the Republican National Committee, for various official communications. The domain name is an abbreviation for "George W. Bush, 43rd" President of the United States. The use of this email domain became public when it was discovered that J. Scott Jennings, the White House's deputy director of political affairs, was using a gwb43.com email address to discuss the firing of the U.S. attorney for Arkansas. Communications by federal employees were also found on georgewbush.com (registered to "Bush-Cheney '04, Inc.") and rnchq.org (registered to "Republican National Committee"). Congressional requests for administration documents while investigating the dismissals of the U.S. attorneys required the Bush administration to reveal that not all internal White House emails were available. Conducting governmental business in this manner is a possible violation of the Presidential Records Act of 1978. Over 5 million emails may have been lost. Greg Palast claims to have come up with 500 of the Karl Rove emails, leading to damaging allegations. In 2009, it was announced that as many as 22 million emails may have been lost.
Document 8: Donald J. Trump Foundation: The Donald J. Trump Foundation is a New York-based private foundation founded and chaired by President of the United States Donald Trump. It has been a source of controversy, criticism and scrutiny. The foundation has been fined for making political contributions and admitted engaging in self-dealing practices to benefit Trump, his family, and businesses. On December 24, 2016, Trump said he intended to dissolve the foundation; as of 2017 he has not done so.
Document 9: L. Patrick Gray: Louis Patrick "Pat" Gray III (July 18, 1916 – July 6, 2005) was Acting Director of the Federal Bureau of Investigation (FBI) from May 2, 1972 to April 27, 1973. During this time, the FBI was in charge of the initial investigation into the burglaries that sparked the Watergate scandal, which eventually led to the resignation of President Nixon. Gray was nominated as permanent Director by Nixon on February 15, 1973, but failed to win Senate confirmation. He resigned as acting FBI director on April 27, 1973, after he admitted to destroying documents received on June 28, 1972, 11 days after the Watergate burglary, that had come from convicted Watergate conspirator E. Howard Hunt's safe, given to him by White House counsel John Dean.
Document 10: Dismissal of James Comey: James Comey, the 7th director of the Federal Bureau of Investigation (FBI), was dismissed by U.S. President Donald Trump on May 9, 2017. Comey had been under public and political pressure as a result of both the FBI's role in the Hillary Clinton email controversy and the FBI's investigation of Russian interference in the 2016 U.S. elections, which also involves a possible collusion with the 2016 Donald Trump campaign.
Document 11: Hillary Clinton presidential campaign, 2008: The 2008 presidential campaign of Hillary Rodham Clinton, then junior United States Senator from New York, was announced on her website on January 20, 2007. Hillary Clinton was previously the First Lady of the United States and First Lady of Arkansas prior to her election as U.S. Senator from New York. She is also the wife of former President Bill Clinton. Clinton was the source of much media speculation since having expressed interest in being a candidate in the 2008 presidential election since at least October 2002.
Document 12: United States House Select Committee to Investigate Alleged Corruptions in Government: United States House Select Committee to Investigate Alleged Corruptions in Government
Document 13: James C. McKay: James "Jim" McKay (February 24, 1917 – November 23, 2015) was an American trial lawyer. As Independent Counsel from 1987 to 1990, he investigated allegations of illicit lobbying and conflicts of interest during the administration of Ronald Reagan, including investigation of then-sitting U.S. Attorney Edwin Meese.
Document 14: Clinton family: The Clinton family is a prominent American political family related to Bill Clinton, the 42nd President of the United States (1993–2001), and his wife Hillary Clinton, the 67th United States Secretary of State (2009–13), Senator from New York (2001–09) and the First Lady of the United States (1993–2001). Their immediate family was the First Family of the United States from 1993 to 2001. In 2016, Hillary Clinton became the first female presidential nominee from a major political party in United States history. The Clintons (Bill and Hillary) are the first married couple to each be nominated for president. She was defeated in the election by businessman Donald Trump.
Document 15: 2016 Democratic National Committee email leak: The 2016 Democratic National Committee email leak is a collection of Democratic National Committee (DNC) emails leaked to and subsequently published by WikiLeaks on July 22, 2016. This collection included 19,252 emails and 8,034 attachments from the DNC, the governing body of the United States' Democratic Party. The leak includes emails from seven key DNC staff members, and date from January 2015 to May 2016. The leaks contents, which suggested the party's leadership had worked to sabotage Sanders' presidential campaign, prompted the resignation of DNC chair Debbie Wasserman Schultz before the Democratic National Convention. After the convention, DNC CEO Amy Dacey, CFO Brad Marshall, and Communications Director Luis Miranda also resigned in the wake of the controversy.
ground_truth: Hillary Clinton email controversy