Mutual Policing:

Robert L Hammond, Laurent Keller:

"Mutual policing is an important mechanism that maintains social harmony in group-living organisms by suppressing the selfish behavior of individuals."

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Wim Bonckaert et al:

"Major evolutionary transitions (Maynard Smith and Szathmáry 1995) require the evolution of mechanisms that moderate within-group conflict (Keller 1999; Queller 2000; Ratnieks et al. 2006). One such mechanism is mutual policing, whereby social control is used to either prevent individuals from acting selfishly or reduce the payoffs from doing so (Ratnieks 1988; Frank 1995; Frank 2003; Wenseleers et al. 2004a; Ratnieks and Wenseleers 2005, 2007; Ratnieks et al. 2006; Wenseleers and Ratnieks 2006b)."