The EEOC has issued its final Enforcement Guidance on Retaliation and Related issues. This document replaces and updates a Compliance Manual from 1998. Also available is a Q&A publication and a Small Business Fact Sheet (links are embedded in the press release below).
The EEOC’s press release is here: https://www.eeoc.gov/eeoc/newsroom/release/8-29-16.cfm
Full text of guidance is here: https://www.eeoc.gov/laws/guidance/retaliation-guidance.cfm