Families for Excellent Schools
The antagonists in the charter schools ballot issue, Question 2, are all over television with expensive ads. The Yes on 2 ads are being paid for by a handful of wealthy financiers hiding behind dark money fronts. The No on 2 ads are paid for by the contributions of thousands of unionized teachers.
Here is a collection of articles on dark money in Massachusetts: WARNING: not for those who are frightened by what unlimited dark money does to our democracy.
The whole point of dark money organizations like Families for Excellent Schools and Great Schools Massachusetts is that the true funders are hidden from the voters. Here's some of what we know, and some reasonable inferences.