<div>The range of the topics you are asking about is rather wide, so I guess one could talk about many postwar movies dealing with these subjects. On leftist political extremes, Wakamatsu Koji comes naturally to mind, especially Sexjack or Tenshi no kokotsu.
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<div>Yoshida Kijū's political trilogy, Eros plus gyakusatsu, Rengoku eroica and Kaigenrei cannot be avoided as well (if you only want to consider political extremes after the 2nd world war, Rengoku eroica fit better than the others, of course).
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<div>By the way, are you also interested in the treatments of the 2-2-6 incident for instance ? As well as Yoshida, Mishima, Suzuki and Kobayashi (Tsuneo, not Masaki) made movies about that, but maybe prewar events don't match what you're searching ? Could you be a little bit more precise ?
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<div>Any way, about "false peace" and political extremes, Teshigahara's Tanin no kao, with its explicit references to war and the nazis, could be interesting (even if it is on the allegorical side of the matter)..
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<div>Very very indirectly, Kinoshita's Nihon no higeki presents in its introduction some press clippings dealing with postwar constitution. </div>
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<div>Well, did I forget Oshima's Nihon no yoru to kiri ? Some hints also, in Fujita and Kawabe's Nippon Zero Nen...</div>
<div>But I guess there are many examples yet.</div>
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<div>Mathieu Capel</div>
<div>Paris</div>