The retainers whose entrenched interests would be lost as a result of his cutbacks brought him a fierce backlash, but Yozan did not hold back and harshly punished those who opposed him, even forcing some to commit hara-kiri.〔【出典】Hiragana Times, 2008年12月号◆【出版社】株式会社ヤック企画 〕"HT266014", "2503258"
From an international point of view, the Japanese financial system was closed and unfair that protected only vested interest groups.〔【出典】『日本経済の秘密』（岸本建夫著）◆【出版社】株式会社ヤック企画 〕"YA01-147", "2302289"
a heavy vested interest
overcome resistance from entrenched political and bureaucratic interests
entrenched political interests
uproot entrenched political interests
fight the vested interests that have been the mainstays of LDP support