Who is in charge? Congress the elected representatives of the people would be the logical answer to me a simple individual.
Why? Because without we the people electing Congress there would be no agencies formed to handle investigations.
So the chicken had to lay the egg but the egg is now claiming extortion when the chicken exercises it's authority. FBI show me the constitutional duty clause you have in the Constitution.
"House investigators nonetheless sniffed out a name, and Mr. Nunes in recent weeks issued a letter and a subpoena demanding more details. Deputy Attorney General Rod Rosenstein’s response was to double down—accusing the House of “extortion” and delivering a speech in which he claimed that “declining to open the FBI’s files to review” is a constitutional “duty.” Justice asked the White House to back its stonewall. And it even began spinning that daddy of all superspook arguments—that revealing any detail about this particular asset could result in “loss of human lives.”