Unlike the mainland China, the Hong Kong Police Force is allowed to purchase weapons and equipments from the United States manufacturers.
This means U.S.-based businesses are making money while HKPF assault the demonstrators using American weapons at the behest of Beijing.
The supplier of HKPF's tear gas canisters:
Combined Systems, Inc.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko