The history of criminal statistics bears testimony to a search for a measure of "criminality" present among a population, a search that led increasingly to a concern about the "dark figure" of crime—that is, about occurrences that by some criteria are called crime yet that are not registered in the statistics of whatever agency was the source of the data being used. Contending arguments arose about the dark figure between the "realists" who emphasized the virtues of com pleteness with which data represent the "real crime" that takes place and the "institutionalists" who emphasize that crime can have valid meaning only in terms of organized, legitimate social responses to it. This paper examines these arguments in the context of police and s...