This document is an introduction to a compendium that summarizes over 90 sessions from a working group focused on combatting human trafficking and modern slavery. It provides background on the working group, called the Nexus Human Trafficking and Modern Slavery Working Group, which was launched in 2014 with the goal of leveraging the skills and networks of its members to end human trafficking and modern slavery through policy changes, partnerships, social impact investments, and other means. The compendium compiled here summarizes information from the working group's weekly conference calls and webinars with over 100 speakers in the anti-trafficking movement. It is intended to educate and mobilize readers to join the fight to end modern slavery.