Ten already provided that information for you:
Strzok co-authored the now-infamous memo, where Comey informed Congress that he was re-opening the investigation into Clinton's emails. In fact, at the time, he even
supported re-opening the investigation, despite his recently revealed disdain for Trump. Seems to me that he's perfectly capable of keeping his private thoughts and his job duties separate.
So, when you come in here hollering about this situation, the rest of us have been noticing the rather large hole in your theory.
If Strzok ever actually intended on acting on his anti-Trump bias, why on Earth did he write the memo that in all likelihood handed Trump the win?