Welcome to Law.com Class Actions: Critical Mass, a weekly briefing for class action and mass tort attorneys.

This week: A federal judge in the cases brought over water contamination in Flint, Michigan, threatened sanctions and a gag order after a defendant’s media campaign threatened a jury trial. Tom Girardi’s public defenders have asked for juror questionnaires, citing substantial media attention and the fame of his estranged wife, Erika Jayne. Find out who got appointed to lead the multidistrict litigation over toxic metals in baby food.