In a Sydney hearing room, the Independent Commission Against Corruption is asking an old and enduring question: where does political influence end and corruption begin. Jeremy Greenwood, a Liberal factional figure, sat before the watchdog this week defending his account of why a former premier's sister-in-law was paid nearly $661,000 for advice that, according to counsel assisting, had already been written by others years before she was engaged. The inquiry is tracing $2 million in payments from a fugitive developer to determine whether they were genuine consulting fees or political donations