CNN[1] says that it is "Nearly 20 groups of Amazon shareholders ... which include the Social Equity Group and Northwest Coalition for Responsible Investment."
[1] http://money.cnn.com/2018/06/18/technology/amazon-facial-rec...
[1] http://money.cnn.com/2018/06/18/technology/amazon-facial-rec...
(It's a more-than-impulse-buy price of ~$1700 right now - but if I were the sort of person who bought single company shares to push my personal causes at shareholder meetings, I'd probably have bought in at a few hundred bucks 5 or more years back...)
[1]: http://www.ipjc.org/wp-content/uploads/2017/10/NWCRI-Annual-...