The site lists people who have received the much-sought after permanent uppehållstillstånd, or PUT.
The aim of Swedish site Migileaks is exposing the Swedish Migration Board. The motto of Migileaks is "stop the fraud" and the site claims that many immigrants who get permission to stay in Sweden do so on false grounds.
One person who's suffering as a result of having his details published on this site is Ali, from Somalia.
He says to Swedish Radio International that one of his fellow Somalis is now targeting him with threats. He says that the person tells him to "get back to Somalia" and threatens him with death if he stays.
A few weeks ago, Ali's car disappeared. Then the anonymous man called, and said that he had taken it.
He continued to press the point about Ali's immigration case, asking why Ali had claimed to have been threatened by Somali rebel group Al-Shabab. "He said that he'd taken my car, and that he can do anything he likes - that if I don't leave Sweden I can die" says Ali.
But the Migileaks website is publishing information that is already in the public domain.
Peter Enander is a judge at the Migration Court in Stockholm. He says that these public details are for anyone to use, and that he can't affect who uses them, and for what ends.
Under Swedish law publicising people's personal details can be a crime. The area is regulated by the law on personal data, and by the Data Inspection Board.
Jonas Angvall, at the Board, says he's not sure whether the website is breaking the law on personal data.
"This is a new phenomenon", he says. He says that the Board will be looking at what kinds of details are being published on Migileaks, and make a decision as to whether it is personally intrusive, or whether it has a legitimate journalistic aim.
Jonas Angvall adds that, if people are the victim of crime, as a result of their details being published, then this would also simply be a matter for the police.