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

This week: Lawsuits over decongestants name nearly 20 companies, including Target and Walgreens. Two pharmacy benefit managers want David Cohen, the special master in the opioid multidistrict litigation, to recuse himself. Find out who made the leadership team in the Covidien hernia mesh multidistrict litigation.