FATCA seems unobtrusive compared to this:
One million British travellers planning to fly to Canada, the Caribbean and Mexico this year face the risk of being turned away at the airport – at the insistence of the US Department of Homeland Security.
...Now the US is demanding passengers' full names, dates of birth and gender from airlines, at least 72 hour[s] before departure from the UK to Canada. The initial requirement is for flights to Toronto, Ottawa, Montreal and the Nova Scotia capital, Halifax – 150 miles from the nearest US territory. A similar stipulation is expected soon for the main airports in western Canada, Vancouver and Calgary.
Any passenger who refuses to comply will be denied boarding. Those who do supply details may find their trip could be abruptly cancelled by the Department of Homeland Security, which says it will "[m]ake boarding pass determinations up until the time a flight leaves the gate ... If a passenger successfully obtains a boarding pass, his/her name is not on the No Fly list." In other words, travellers cannot find out whether they will be accepted on board until they reach the airport.Any objections?