The UK doctor who originally blew the whistle on the link between MMR vaccines and autism, Andrew Wakefield, was blacklisted simply for saying that perhaps the component vaccines should be administered separately rather than together (and he followed this protocol with his own children, strange for an alleged "anti-vaxxer"). He also said that a British government official told him that any public admission that MMR vaxxes were harmful would lead to such a massive amount of compensation being paid out that it was easier just to suppress the whole matter instead.
Incidentally, proof positive that the political establishment regarded Wakefield as a serious threat comes from the first line of his Wikipedia entry: "
Andrew Jeremy Wakefield (born 3 September 1956) is a British
fraudster, discredited academic,
anti-vaccine activist, and former physician. He was
struck off the medical register for his involvement in
The Lancet MMR autism fraud, a 1998 study that fraudulently claimed a link between the measles, mumps, and rubella (MMR) vaccine and
autism". Whenever you see a hysterical avalanche of pejoratives like that (notice that variations of the word "fraud" appear
three times in just two sentences!) you can tell that the subject poses a danger to powerful and corrupt people