Q. Some cemeteries in Latin American cities, due to zoning restrictions, are located on very poor and crime ridden neighborhoods. It is not unusual to find garbage or feces thrown over even relative high fences. Can attendants to a Levaya or the unveiling of a Matzeiva that are close to that site, make a Mechitza by asking some of the attendants to line up with their backs to that location and cover the site, so Kaddish and other Tefilos and Tehilim can be said? Can those people forming the Mechitza also answer Kaddish?
A. See Shulchan Aruch (O.H. 82: 1, 83: 1) regarding the prohibition of davening or reciting Devarim Shebekdusha facing such a situation, and the Mechitza needed.
Shulchan Aruch (O.H. 630: 12) rules that one can place people to create a Mechitza that constitutes a missing wall of a Suka.
Har Tzvi (O.H.1: 86) indeed addresses our shailah and maintains that a Mechitza made of people can be placed for exactly that purpose. Furthermore, he maintains that the people forming that Mechitza, can also answer amen and participate in the ceremony.