Quote from Ricter:
Imho, the so-called circle mentioned by the OP is formed only on the political axis, where the economic extreme of communism and the economic extreme of laissez faire capitalism (hereafter privatism) are established through authoritarianism. This political extreme, facism, is the link. The other political extreme, anarchy, cannot force, ie. cannot "join" either economic extreme, that is make communism and privatism resemble each other. All four implied politicoeconomic systems are plausible: anarcho (read democratic) socialism, democratic privatism, authoritarian (read fascistic) socialism, and authoritarian privatism.
It does not seem to make sense that the other axis, the political axis, can be viewed as bent 'round to form a circle from the perspective of either pure communism, or pure privatism, as neither of those indicates what form of power will be exercised to bend that axis.
The commonality I asked for between teabaggers and the May Day celebrants of course had economics as at least an ingredient.
To see a parallel between the sources of their similar grievences you'd have to make the observation with a wider lens than the one you're looking through.