I don’t think Greater Boston Legal Services is publicly funded.I read through(quickly) their 2005 annual report.It looks like its funded through donations.
I found this quote from the president of GBLS which hints that they get state money from the state legislature: " So on behalf of everyone at Greater Boston Legal Services, I thank the Mass Bar Association and all its members for supporting this work. You support us with funding through the Mass Bar Foundation, through contributions from your firms and from your own pockets, through the thousands of hours you devote to pro bono work for our clients, through supporting our requests to the legislature for more funding and above all by standing up publicly for the ideal of equal access to justice in our adversarial justice system."
Perhaps they are interested in keeping this quiet.