When O’Melveny & Myers partners Robert Welsh and F. Curt Kirschner won more than $17 million for a chain of hospitals this month, it marked their first jury verdict in what they say is a growing area of their labor practice — suing unions over their tactics in “corporate campaigns.”

Kirschner uses the term “corporate campaign” to describe a union’s attempts during an organizing effort to put pressure on a company by, for instance, striking at its public image. Union-side lawyers, who may call them “comprehensive campaigns,” describe the strategy as one that involves a broad investigation into an employer’s conduct.