<Li> Trade unions by country </Li> <Li> Trade union federations </Li> <Li> <Ul> <Li> ITUC </Li> <Li> IWA </Li> <Li> WFTU </Li> </Ul> </Li> <Ul> <Li> ITUC </Li> <Li> IWA </Li> <Li> WFTU </Li> </Ul>

When did the 40 hour work week start in the us