Possible Clues:

• Formerly employed by those transferring money from The Job on gangster instructions
• Management directives perhaps to man of letters employed in the past by those transferring money
• What the men of letters gave waiter, in a manner of speaking, were once written out in exchange for notes
• Sounds like instructions to the Women of Letters for settling accounts
• Plato's novel gets definite requests for capital transfers
• Job for gangster with contracts for old system of transferring money
• LSD operators organised documents for payment