Modeling agencies do not deal with unions since there is currently no such union for models. However, talent agencies that employ actors do deal with unions. If an actor belongs to a union then their talent agency must abide by the rules and guidelines laid out by the union, such as pay rates, hours worked, etc.
Check out the websites of the agencies listed in this link: http://www.joeedelman.com/agencies/agency_il.php
This link has a list of all the agencies in the Philippines and also lists whether they are verified/credible or not: http://www.jurgita.com/agencies/philippine-agencies
If you are looking for modeling agencies in Newry, Pennsylvania, this link contains all the modeling agencies located in the Pennsylvania area: http://www.joeedelman.com/agencies/agency_pa.php
The permanent changes that took place for labor unions as a result of the new deal was social security, public works, and federal agencies.
Yes, there are electrician unions (IBEW) in California that will train you to be an electrician. See link below for the apprenticeships located in California.
This link will show you three modeling agencies in the Mauritius area...there aren't many: http://www.jurgita.com/agencies/mauritian-agencies
This link will take you to a list of various modeling agencies in Florida. Be sure to check out their websites to see what their requirements are for models:http://www.joeedelman.com/agencies/agency_fl.php
Here is a link to legit modeling agencies in MA:http://www.joeedelman.com/agencies/agency_ma.php
This link will take you to a list of Ohio modeling agencies. Be sure to check out the websites to see what the requirements are and if you fit them: http://www.joeedelman.com/agencies/agency_oh.php
This link will give you a list of legit modeling agencies in the Boston area: http://www.joeedelman.com/agencies/agency_ma.php#Boston
This link will take you to a list of reputable and legit Quebec talent agencies: http://www.actramontreal.ca/actra/talent.htm
craft unions and industrial unions