they had betrayed
-avaient trahi
Past perfect they conjugation of betray.

betray

For a split second the banks were lined up as crooks with obligations to the public they had betrayed.
Pendant quelques instants les banques ont été dénoncées comme des escrocs ayant des obligations vis-à-vis du public qu'elles avaient arnaqué.
The war showed that the parties of the Second International had not stood the test, that they had betrayed the working class and had surrendered their banners to the imperialist bourgeoisie of their own countries.
La guerre montra que les partis de la IIe Internationale n’avaient pu résister à l’épreuve, qu’ils avaient trahi la classe ouvrière et incliné leurs drapeaux devant leur bourgeoisie nationale, leur bourgeoisie impérialiste.
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