Heavy investment in security and a landscaped moat and electric fence will neutralise any potential threat from the growing anarchist presence.

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On the right, nativist voices in last year's primary campaign gave birth to phrases such as "electric fence" (Herman Cain), "self-deportation" (Mitt Romney) and other nuggets that turned Hispanic voters off.

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Plans are also afoot, according to Patton, to install an expensive high-tech electric perimeter fence with an intruder alarm.

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Later, at a nearby farm, Ms. Nassauer set a round tiller blade atop an electric-fence post, so that it resembled a sunflower.

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