abetter

s. fautor, promovedor, fomentador; instigador, cómplice, partidario

instigador, cómplice

(n.) = instigador, promotor, cómplice
Ex: Thereafter, it became clear to the city police that the hotel owners acted hand-in-glove with the abettors of prostitution.
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* aiders and abettors = cómplices e instigadores