why did LH go to the US Justice Department
If you do business in the US, have a base or office in the US, a joint venture with US citizens or companies or meet any other of a load of other criteria, then you are covered by US law & liable to prosecution under their legal system.
The penalties can be very severe for dodgy dealing & going out of business can be the least of your concerns, depending on which of the various laws you've broken. Try having a google at Foreign & Corrupt Practices......