Answer:
The answer is: The litigation lawyer must inform Mr. X (through his tax lawyer) and ask for approval from management or senior partnership.
Explanation:
Mr. X is currently being serviced by ABC law firm. If Paula went to ABC seeking for them to sue Mr. X, then the following should be done:
In my opinion Paula will have to look for an attorney somewhere else. ABC may earn some money with this trial but their public image will be damaged.