Here is some recent coverage of the campaign:
CNN: "Supreme Court ruling helps silence worker lawsuits. But these law students are fighting back"
http://money.cnn.com/2018/06/18/news/companies/mandatory-arbitration-law-students/index.html
Law.com: "New Study Finds Most Law Firms Mum on Mandatory Arbitration for Summer Associates"
https://www.law.com/2018/06/11/new-study-finds-most-law-firms-mum-on-mandatory-arbitration-for-summer-associates/
Bloomberg: “Many Big Law Firms Won’t Disclose Arbitration Policy”
https://biglawbusiness.com/many-big-law-firms-wont-disclose-arbitration-policy/
American Lawyer: “Will Law Firms Bow to Pressure to End Mandatory Arbitration?"
https://www.law.com/2018/05/24/will-law-firms-bow-to-pressure-to-end-mandatory-arbitration/