During world war ii, unionized workers agreed
to work without pay
to go without vacations or days off
to live near the factories to save time commuting
to keep production going by not striking

To keep production going by not striking.

Explanation:

On December 15, 1941, a policy against striking in war industries had the absolute vote of the Executive Council of the American Federation of Labor. The attack against Pearl Harbor on December 7th caused the U.S. to declare war on Japan, and soon after on fascist Germany and Italy.  Some days following the attack, Roosevelt met with representatives of labor and industry looking for an agreement over a war labor policy preventing strikes that would affect production during the war.