I hate this company and their pathetic little whiny 4yr old boy voice of "it's not illegal" boo hoo hoo. Just because it is unethical and morally bankrupt doesn't appear to phase these narcissistic psychopaths. Unfortunately because they are totally worthless it is hard to fight this site. What you can do though is:

Complain (often!) to the FTC (you can do this anonymously): https://www.ftccomplaintassistant.gov/Company#crnt

And to your rep/senator
A) Tell them to vote for The Data Broker Accountability and Transparency Act (or a new variation of this bill)
B) Send them this report: https://www.ftc.gov/system/files/documents/reports/data-brokers-call-transparency-accountability-report-federal-trade-commission-may-2014/*******databrokerreport.pdf
Apparently most reps can't read so you might want to put in a short synopsis. (http://www.regblog.org/2014/06/19/19-slater-costs-and-benefits-of-data-brokers/)
This is harder to do anonymously however, in most cases you can use the office address and phone of the rep/senator. Go to their web site and copy it then use the link to complain. I personally find it fantastic that they then spam themselves.

- With enough complaints maybe we can finally get the gov't to crack down and make sharing info like this illegal!

Spread the word. If every single person complained, then maybe we can put these companies out of business for good!