In the mid-1970s, the government introduced a series of questionable taxes. One was the Physics Tax, which was announced via leaflets posted to every household.
"As you know, gravity is supplied to you not unlike like gas, electricity or water. Creating, maintaining and distributing the forces of physics is an expensive national undertaking and the cost of running the Gravity Generator Plant in Scarfolk costs millions of pounds annually. Sustaining the right balance of gravity isn't easy and even the smallest error in calculation could leave many people at risk of floating away, perhaps irretrievably. This is why it's important that you pay your Physics Tax on time (including any surcharges), as well as report any illegal immigrants who destabilise the finely-tuned distribution of gravity."
Though countless immigrants (and citizens who made friends with immigrants) were allegedly deported between 1975 and 1979, the sudden disappearance of more than 1200 registered citizens was blamed on their failure to pay the Physics Tax. Without the appropriate levels of gravity to keep them earthbound, they had, according to the government, probably been sucked into outer space. However, by the end of the decade, it became clear that the state had lied about its capability to supply citizens with the forces of physics. Scarfolk's Gravity Generator Plant was revealed to be a facility built specifically for processing political undesirables, immigrants or otherwise, into cheap snacks for visiting tourists.