FBI Director Comey was just fired in an open letter from President Trump. Here is the pinnacle of his offense, in my opinion:

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Senator: was there classified information on former congressman Weiners computer?
Comey: yes
Senator: who sent it to him?
Comey: his then spouse Huma Abedin appears to have had a regular practice of forwarding emails to him for him I think to print out for her so she could then deliver them to the Secretary of State.
Senator: did Congress former congressman Weiner read the classified material?
Comey: (pause) I don't... I don't think so. I think is descriptive I don't think we've been able to interview him because he has
pending criminal problems of other sorts, but my understanding is that his role would be to print them out as a matter of convenience.
Senator: if he did read them would he have committed a crime?
Comey: potentially
Senator: would his spouse had committed a crime?
Comey: Again potentially. it would depend upon a number of things.
Senator: is there an investigation with respect to the two of them?
Comey: there was. we completed it.
Senator: why did you conclude neither of them committed a crime?
Comey: because with respect to Miss Abedin, in a particular, we didn't have any indication that she had a sense that what she was doing was in violation of the law and couldn't prove any sort of criminal intent. its really the central problem we have with the whole email investigation was proving that people knew the secretary and others knew that they were doing so that they were communicating about classified information in a way that they shouldn't be and proving that they had some sense that they were doing something unlawful. that was our burden and we weren't able to meet it
Senator: so she thought it was okay to send her husband the information?
Comey: well I think I don't get too much into what she thought we could not prove that the people sending the information either in that case or the other case with the secretary within any kind of mens rea, any kind of criminal intent

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Here are some rather insightful comments from the memorandum produced by Deputy Attorney General Rosenstein:

"Over the past year, however, the FBI's reputation and credibility have suffered substantial damage, and it has affected the entire Department of Justice. That is deeply troubling to many Department employees and veterans, legislators and citizens."

"I cannot defend the Director's handling of the conclusion of the investigation of Secretary Clinton's emails, and I do not understand his refusal to accept the nearly universal judgment that he was mistaken. Almost everyone agrees that the Director made serious mistakes; it is one of the few issues unites people of diverse perspectives."

"The Director was wrong to usurp the Attorney General's authority on July 5, 2016, and announce his conclusioon that the case should be closed without prosecution."

"The Director now defends his decision by asserting that he believed the Attorney General Loretta Lynch had a conflict."

"Compounding the Error, the Director ignored another longstanding principle: we do not hold pres conferences to release derogatory information about the subject of a declined criminal investigation."

"The Director laid out his version of the facts for the news media as if it were a closing argument, but without a trial."

"It is a textbook example of what federal prosecutors and agents are taught not to do."

"Although the President has the power to remove an FBI director, the decision should not be taken lightly. I agree with the nearly unanimous opinion of former Department officials. The way the Director handled the conclusion of the email investigation was wrong. As a result, the FBI is unlikely to regain public trust until it has a Director who understands the gravity of the mistakes and pledges never to repeat them. having refused to admit his errors, the Director cannot be expected to implement the necessary corrective actions."

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Bottom Line

For anyone who has handled ANY sensitive material (from HIPAA to classified documents), its pretty self explanatory that you handle it carefully and any mishandling is entirely your fault. This is part of the actual law.