[1] http://www.cnbc.com/2017/04/25/workers-involved-in-union-act...
[2] http://prospect.org/article/charge-time-electric-car-workers...
[3] http://dailycaller.com/2017/04/18/toxic-waste-spill-at-tesla...
[4] http://www.businessinsider.com/elon-musk-launches-investigat...