how about changing it into "zweckdienliche Betriebe"
just a suggestion

purpose-dedicated activities

Oxford-Duden has "appropriate" for "zweckdienlich"; I think it should work here, too.

According to the reference, a "Zweckbetrieb" is a tax-exempt fundraising operation which exists purely to raise essential funds for a charitable purpose, e.g. to further the work of a public-benefit foundation. In that sense I agree with Kim's suggestion of "dedicated establishment" but I think the tax-relief aspect is worth mentioning too. Often a sheltered workshop will have a shop selling its products, not exactly non-profit but all the profits would be ploughed back into the running of the workshop.

...heißen die in der USA. A Not-for-Profit Organization ist, was Deborah absolut richtig beschrieben hat. Eine solche "organization" kann viele verschiedene Arten von gemeinnützigen Aktivitäten betreiben, u.a. "operational activities", z.B. Werkstätten. Dies nur zur Klärung, denn Deborah hat nach meiner Meinung die Punkte verdient.....:):)

In addition, specific facilities were established in conjunction with workshops for the physically disadvantaged and general-purpose sites set up for the long-term unemployed.