Posted by Chris Chritie’s staff was caught intentionally creating severe public disruptions (traffic jams). 
However, the situation is not complicated. Whether he knew or not–it is highly unlikely he did know, given the seriousness and visibility of his offense–he should have known because his staff is demonstrably guilty. He is either a bad manager or a liar or both.
How can you not know what is going on right under your nose by the people you hired and you supervise? Remember Nixon? People in these positions must know how to lie. Mr. Christie, you are probably adding insult to injury by saying you didn’t know.