The 1998 paper that linked MMR vaccination with autism has had a long way to fall. It made, of course, a huge media sensation, and energized the whole vaccination/autism controversy that still (in spite of evidence) goes on. But it didn't look very robust from the start, scientifically. And over the years it's gone from "Really needs shoring up" to "hasn't been reproduced" to "looks like there's something wrong with it" to "main conclusions retracted" to the final, lowest level: outright fraud.
Here's a good history of the whole affair in the BMJ. And here's the first part of a series of articles by Brian Deer, the journalist who dug into the study and found how fraudulent it really was. Not one of the 12 cases in Wakefield's original study hold up; the data were manipulated in every single one to make it fit his hypothesis. His hypothesis that he was getting grant money for. His hypothesis that he was already planning lawsuits around, before the study even started.
His hypothesis, I might add, that has led to completely unnecessary suffering among the unvaccinated children this scare has produced over the years, and has diverted enormous amounts of time, energy, and money away from useful study of autism. This sort of deliberate action is really hard to contemplate, as a reasonable human being - it's like some sort of massive campaign to persuade people to throw bricks through the windows of ambulances.
In a better world, we'd be getting expressions of sorrow and contrition from all the celebrities and others who've profited from this business. But that's not going to happen, is it?