Work Stoppages Technical Note
Last Modified Date: March 01, 2021
The Bureau of Labor Statistics provides information on major (1,000 workers or more) work stoppages in
the United States. The number of workers includes those idled for one shift or longer in the
establishment(s) directly involved in the dispute as well as those in the establishment idled for
related reasons, such as their facility is closed down during the stoppage. An attempt is made to
contact the parties involved in the work stoppage (employer, employer group, and union) to determine
whether the duration and number of workers idled by the stoppage meet the thresholds for inclusion in
this report. For additional information on the concepts, data sources, design, measures, and history of
the work stoppages program, see www.bls.gov/opub/hom/wsp/home.htm.
Detailed monthly work stoppage data since 1993 are available at
www.bls.gov/web/wkstp/monthly-listing.htm and includes organizations involved, location, beginning and
ending dates, industry, ownership, the number of workers, and total days of idleness.
Annual historical major work stoppages data from 1947 to present, including the number of work
stoppages, workers idled, and total days of idleness, are available at
Historical Bureau of Labor Statistics work stoppages publications are available from 1936 to 1979
The latest Union Members report is available at www.bls.gov/news.release/pdf/union2.pdf.