That is a lie, labor movements shaped those long before there were a legal concept of unions. Unions != labor movements. Unions are often a result of labor movements, but they are not the same thing. For example, the 8-hour work week was demanded by labor movements who weren't organized as modern unions are organized.
Edit: Labor movements often called themselves unions though, but that was just a group of people getting together to protest and demand rights and has nothing to do with how modern unions works.
Edit: Labor movements often called themselves unions though, but that was just a group of people getting together to protest and demand rights and has nothing to do with how modern unions works.