Protesters Field Guide to Effective Actionhttps://streetcivics.com/a-protesters-field-guide-to-effective-action/
Mutual Aid Hub: https://www.mutualaidhub.org/
State Tactics, crowd control: https://www.globalsecurity.org/military/library/policy/army/fm/19-15/CH8.htm
Formations Guide, VIP protection: https://resourcehub01.blob.core.windows.net/training-files/Training%20Materials/025%20STM-FPU/025-048%20Basic%20tactics%20on%20VIP%20protection.pdf
Close Protection Guides by a private security firm: https://www.westminstersecurity.co.uk/close-protection/operational-planning/
Additional Protest Preparedness Guide: https://pdfhost.io/v/QjJkZDLRJ9_Some_preparations_for_and_responses_to_basic_threats_at_protests