Sentence:  The anonymous "Song on the Venality of the Judges", which dates from this period, regarded those sitting in judgment as 'seduced from justice' by partiality and bribes and those pleading in court as guilty of <WSD>'ambidextry</WSD>', i.e. of accepting gifts not just from their own client, but from both parties ('pleaders. . . take with both hands'). 
Meaning of the word marked with <WSD> tags:  Two-sidedness; Embracing or engaging in both sides of a dichotomy.