Between 1945 and 1956, Austria saw four general elections produce parliaments in which the opposition’s tussles with government were choreographed, for which Austrians coined the term Bereichsopposition. This might translate as opposition arranged within a set area; Marxist social scientist Otto Kirchheimer, writing in 1957, translates it as "opposition of principle," which he defined later as "'the desire for a degree of goal displacement incompatible with the constitutional requirements of a given system".
Kirchheimer’s 1957 paper The Waning of Opposition in Parliamentary Regimes rails at the birth of the cartel arrangement of politics, whereby a group of parties with little to differentiate them dominate parliamentary politics. He notes this was an "extreme procedure" in Austria, but that the same arrangements were emerging in (West) Germany, France and Italy.
These three were the main signatories to the Treaty of Rome the next year. This transformed the European Coal and Steel Community, intended to prevent another war between France and Germany, into the EEC, the proto-EU.
Left-leaning political scientists like Kirchheimer and Peter Mair (right - whose Ruling the Void references the former’s essay) are pessimistic about the outcome of cartel politics. This seems to stem from a middle-class phobia of the revivifying power of the popular vote: a primal suspicion that universal suffrage gave the wrong people the vote. Walter Bagehot’s fear that "ultra-democratic" politics (universal suffrage – "the rich and wise are not to have, by explicit law, more votes than the poor and stupid") will lead to "violent laws" leads straight to Mair’s phobia of populist politics.
Think of this when you hear Conservative, Labour and Lib Dem politicians slate UKIP: you are hearing the self-serving super-elite of the anti-democratic political cartel, perpetually mired in oppositionalism to the mechanisms of government in Brussels, inform you that universal suffrage gave the wrong people the vote.
The Waning of Opposition in Parliamentary Regimes - Otto Kirchheimer, Social Research, Vol. 24, No. 2, Summer 1957. Link takes you to the essay on JSTOR, where permissions may be required. You can click here to try to access the pdf
Political Perfectionism and the 'Anti-System' Party - Michael keren, Party Politics 6, January 2000: a summary of the article giving Kirchheimer's definition of "opposition of principle"
Treaty establishing the European Economic Community (Treaty of Rome)
The English Constitution - Walter Bagehot, second edition, 1873. The quote about giving the vote to the "poor and stupid" is on p127 of the pdf