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Research Guides@Tufts

Social Science Data and Statistics Resources

United States Crime & Law Enforcement

For decades, the Southern Poverty Law Center has conducted annual censuses of US-based hate groups, which it defines as those with “beliefs or practices that attack or malign an entire class of people, typically for their immutable characteristics.” Its 2020 review found 838 such groups — a decline from prior years, which the researchers attribute to several factors, including the COVID-19 pandemic, the rise of difficult-to-track online networks, and “the continuing collapse of the Ku Klux Klan.” The center’s map of 2000–2020 findingslinks to annual spreadsheets that detail each group’s title, location, and ideology. (from

More police misconduct complaints. The New York Civil Liberties Union has updated its NYPD misconduct complaint database to include “the race or ethnicity of the impacted person and officer, incident location, current employment status of the officer, and other data,” and to remove duplicates in the original records obtained from the city. Also: Philadelphia publishes monthly-updated data on police complaints from the past five years. PreviouslyProPublica’s subset of the NYPD data (DIP 2020.07.29); and CPDP’s database of complaints against Chicago officers (DIP 2015.11.25). Read more: The Financial Times has compared and analyzed these cities’ datasets, finding that the 10% most-cited officers account for roughly a third of all complaints. (from