Sentence:  A professional bank robber commented on this [a point in the thief's memoir]: 'Perhaps the author means by this that the <WSD>fixer</WSD> with whom he is acquainted works only on crimes not involving violence. It is true that there are specialists even in the fix line, and a man who has an in [in = advantageous position] to fix con cases might not be able to fix robbery cases. But if the author means that the fix does not exist in armed robbery, he is badly mistaken. It is merely a matter of knowing the right party to go to.' 
Meaning of the word marked with <WSD> tags:  A person who arranges immunity for defendants by tampering with the justice system via bribery or extortion, especially as a business endeavor for profit.