There are certainly allegations that have been documented in the past about ways in which the Tamil Tigers engaged in something along those lines within the Tamil community. That's the only one that I am readily aware of. I wouldn't be at all surprised if it has happened in other communities also.
Certainly expatriate communities are viewed by a whole host of people—certainly by family members, but also by governments—as an incredibly important source of revenue. I'm sure sometimes they find this a temptation that's impossible to resist.