Col. Jeff Cooper suggested a system that “would make sure, first, that a riot would stop; and second, that only the leaders would feel the weight of social disapproval.”
Of course, since this is Col. Jeff Cooper we’re talking about, his recommended system was a weapon system, a suppressed .22:
This weapon, properly sighted and equipped with a noise suppressor, may be used with surgical delicacy to neutralize mob leaders without risk to other members of the group, without noise and with scant danger of death to the subject. A low-velocity 22 bullet in the lung will not knock a man down, and in these days of modern antisepsis it will almost never kill him if he can get to a hospital in a reasonable time. It will, however, absolutely terminate his interest in leading a riot.
The Israelis took his advice.
Seems like it would also be useful in a zombie invasion. I quit watching after a few episodes, but I always wondered why the protagonists of The Walking Dead carried around big guns instead of silenced .22s.