How to use in class:
I think this demonstrates how good old descriptive data collection plays a valuable roll in law enforcement, social justice, etc.
I think this demonstrates why well-visualized data may be a more compelling way of sharing information than data in tables.
Another way to use this is for your students to create a methods section based upon the data collection information provided on the website:
You can make the data more personalized for your class by digging down to state-wide data.
In addition to the maps, the website includes various other descriptive data quantifying different hate groups in the US.
I used this in class along with other examples of how data can be mixed with maps in order to provide information on regions/states.
This could also be used in a Social Psychology class in order to illustrate the presence of organized, deliberate prejudice in our society.