10 biggest strikes in U.S. history

Published On: Sep 17 2012 10:21:36 AM CDT   Updated On: Feb 02 2015 09:47:27 AM CST
Oil fracking in California

The United Steelworkers union asked union workers at nine U.S. refineries to stop working after a national contract covering dozens of oil facilities expired on Monday. Take a look back at the 10 biggest strikes in U.S. history.