hayan decrecido
-they/you have decreased
Present perfect subjunctiveellos/ellas/ustedesconjugation ofdecrecer.

decrecer

Este es justamente el objetivo que deseamos conseguir; esperamos que, al iniciar formalmente la campaña de rectificación, hayan decrecido ya en gran medida el subjetivismo, el sectarismo y el burocratismo.
That is precisely the end we hope to achieve. Our hope is that by the time the rectification movement formally starts, subjectivism, sectarianism and bureaucracy will have been considerably reduced.
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