You mean abusing R-1 and R-2 religious worker visas?
FSO recruiters in Hungary had a complete hat pack on how to handle US embassies on this matter.
OSA had all the details on each and every interview the applicants got and they had all the phone numbers and names of all officials.
Also, OSA FLB has some kind of a line to the US Dept of State in case something went wrong here locally.
They drilled the recruits on what to say and kept sending people back again and again to get them out to FSO. Some of them could not even speak English properly.
But around 1996 fortunately some losers who were recruited have completely pissed off the official who handled the visa, so for about 1 year it was pretty hard to get an R1 visa.
It got "handled" by OSA later though.