YOU SAID:

I would commit brutal crimes for you

INTO JAPANESE

あなたのためなら残忍な犯罪も犯します

BACK INTO ENGLISH

I would commit a brutal crime for you

INTO JAPANESE

あなたのためなら残忍な犯罪を犯します

BACK INTO ENGLISH

I'll commit a brutal crime for you

INTO JAPANESE

あなたの代わりに凶悪犯罪を犯します

BACK INTO ENGLISH

commit a heinous crime on your behalf

INTO JAPANESE

あなたに代わって凶悪な犯罪を犯す

BACK INTO ENGLISH

commit a heinous crime on your behalf