They are one of many groups to make missionary or charitable trips to the country. The Dominican Baseball Guy has recently blogged about Manny Acta's charitable organization (ImpACTA Kids Foundation) and David Ortiz's organization (David Ortiz Children's Fund).
Roberto's Kids is another great organization that donates baseball equipment throughout the Dominican Republic. The Dominican Sports and Education Academy is another international organization that comes to mind as providing a great service to youths in the Dominican Republic.
There are many more baseball focused religious and charitable groups that do great work in the Dominican Republic. These are just the ones that the Dominican Baseball Guy has become acquainted with. Please leave a comment if you know of other groups working in the country, or visit the sites listed here and make a donation if you can.