Undoubtedly the deceitful persons should be done away with deceitful means. Surely it is no sin. to destroy them by frauds.
निकृत्या निकृतिप्रज्ञा हन्तव्या इति निश्चयः। न हि नैकृतिकं हत्वा निकृत्या पापमुच्यते॥