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There are two principal methods of collecting data on crime in the United States, crimes reported to law enforcement from the FBI; and the National Crime Victimization Survey from the Bureau Of Justice Statistics based on a census-like national survey to get an approximate count of all crime. The report (link below) and my website Crime in America provide further explanations.
Any account of crime in the United States is principally based on these two methods of data collection (there are others like Gallup and specific research efforts).
As to a need for a national survey to gauge all crime, 41 percent of violent crimes (a considerable decrease from previous years) are reported to law enforcement. It’s much less for property crime. Only a survey can answer questions as to “all” crime.