Final answer:
There are three types of building trade unions found today: International, National, and Regional unions.
Step-by-step explanation:
The three types of building trade unions found today are International, National, and Regional unions. International unions, such as the International Brotherhood of Electrical Workers (IBEW), operate on a global scale and have members from different countries. National unions, like the United Brotherhood of Carpenters and Joiners of America (UBC), operate within a specific country. Regional unions, such as the Electrical Workers Local 134 in Chicago, operate within a specific region or locality.
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