I totally agree with you that this would be the best place to start, because it's the weak point in our system. Foreign interference is not just political in nature,; it also takes the form of influence and intimidation. All authoritarian governments that practise intimidation will work from within communities, whether to embed agents there, or simply to intimidate the people. There is no doubt whatsoever that the authorities should give special attention to such communities.
The problem facing us today, however, is that the legislative system does not give the police the tools to which Mr. German alluded.