Why was there an effort to organize workers into labor unions? trying to pass all my classes and i cant find this answer anywhere

In fbsusvacb. Gg’s can

The founder of the byzantine  empire  and its first  emperor,  constantine  the great,  movedthe  capital of the roman empire  to the city of byzantium in 330 ce, and renamed it  constantinople.  constantine  the great also legalized christianity, which had previously been persecuted in the  roman empire.