you can usually find stuff with the right keywords on google, and throwing in .pdf the more you search the more interesting things you find. If it is academic read citations, a lot is from LE agencies though. if you find anything interesting post in in this sub forum with an [intel] tag has been a while since I last searched for some LE docs, seems they are getting a little bit better at keeping their shit internal but there will always be unintentional leaks when they throw shit on the internet or it is widely disseminated even if it has FOUO stamped on it.