An explosion at a West Virigina coal mine owned by Massey Energy at 4:30 this afternoon left six miners dead and 21 missing.

Rachelle Honeycutt works at an oil refinery in Washington State. Sam Schaffer is a skilled sheet metal worker from West Virginia. Javier Almazan organizes workers in south Florida and Cathy Merkel is an registrar in Maryland. They’re all union members. And in a few days, all four will be graduates of one of the crown jewels of the labor movement: The National Labor College.