likely only people threatening him are his city folk he made promises too and and promptly forgot as he filled his own pockets.
He finally moved into Newark since 2013? http://www.americanthinker.com/blog/2013/10/cory_bookers_imaginary_newark_residence.html
There were threats while he was Mayor as well.
October 14, 2013
https://www.buzzfeed.com/rubycramer/cory-booker-yes-i-live-in-newark?utm_term=.owXbypYBl#.enk5eZ6Dj