Explain why labor unions opposed the use of child labor.

Well because they were children. They needed to be in school, not working in poor conditions in a factory. The reason they were apposed was the reason why everyone should be apposed, because child labor is inhumane. 

This is what i found on google “the first mobile phone call was made 40 years ago today. on april 3, 1973, motorola employee martin cooper stood in midtown manhattan and placed a call to the headquarters of bell labs in new jersey.” i hope this you for what your looking.