I'm a few days behind on history. I should catch them up tomorrow.
March 31
President Martin Van Buren issues a broadly-applicable executive order granting the 10 hour day to all government employees engaged in manual labor - 1840

Cowboys earning $40 per month begin what is to become an unsuccessful 2 1/2 month strike for higher wages at five ranches in the Texas Panhandle - 1883
Cesar Chavez born in Yuma, AZ.- 1927
Pres. Franklin D. Roosevelt signs legislation establishing the Civilian Conservation Corps, to help alleviate suffering during the Depression. By the time the program ended after the start of World War II it had provided jobs for more than six million men and boys. The average enrollee gained 11 pounds in his first three months - 1933
Wisconsin state troopers fail to get scabs across the picket line to break a 76-day Allis-Chalmers strike in Milwaukee led by UAW Local 248. The plant remained closed until the government negotiated a compromise - 1941
Labor history found here:
http://www.unionist.com/today-in-labor-history & here:
http://www.unionist.com/today-in-labor-history