There are four specific areas where there are serious grounds to suspect that James Comey broke the law while he was FBI Director:

First, his handling of the Hillary Clinton email investigation. Why was no Grand Jury empanelled in this case? Why was no search warrant issued? Why was immunity granted to Clinton aides, which effectively stripped Congress of its power to issue subpoenas to gather evidence from phones and laptops before they were destroyed?

And does all this amount to Obstruction of Justice?

Second, the manner in which James Comey closed the Clinton email investigation. He testified to Congress that he made the decision to clear Hillary Clinton after she was interviewed by the FBI. But FBI documents suggest that it was before. Does this constitute Perjury/Lying to Congress?