According to Bloomberg BNA, the number of major work stoppages increased last year, from 11 in 2014, to 12 in 2015, although the number of stoppages remains near record lows. The number of workers represented by unions also fell to 12.3 percent (combination of private and public sector employees).

Members of the International Brotherhood of Teamsters (IBT) conducted a four-day strike at several US Foods locations in Arizona and California. The parties have been engaged in lengthy collective bargaining negotiations, but the sides have not held contract talks since January 22, 2015.

USC Keck School of Medicine health care workers represented by the National Union of Healthcare Workers conducted a one day strike. The hospital and the union have been in contract negotiations for over a year.

A morning commute in Minneapolis was disrupted by a large protest by non-union janitorial workers seeking better pay and working conditions.

A six month lockout appears to be near an end after Allegheny Technologies Inc. (ATI) and the USW announced a tentative contract settlement covering 2,200 ATI workers in six states. Details regarding the tentative four-year proposal and a related back-to-work agreement are being withheld pending ratification by members of USW local unions at 12 ATI facilities.

Nonunion short-haul drivers in California for two subsidiaries of XPO Logistics Inc., XPO Cartage and XPO Port Services, walked off their jobs as part of a one-day strike at the ports of Los Angeles and Long Beach. The latest work stoppage is part of an ongoing effort, launched in August 2013, at the neighboring ports of Los Angeles and Long Beach by short-haul drivers pushing to persuade drayage companies to classify them as direct employees, and to allow Teamsters representation.