It's been widely known for years. Search for EcoHealth Alliance and Peter Daszack if you want to learn more.
Briefly, under Obama gain of function research was banned for a while. During this time Fauci signed off on illegal grants to fund GoF research, funnelled through a British NGO in order to evade detection and the ban. The NGO didn't do the research themselves, they then sent the money to Wuhan to fund experiments done there. Thus Fauci was using US money to do banned research, which he then lied about under oath to Congress. It's for this sort of reason that he's now been pardoned by Biden, as otherwise he would likely have been prosecuted. Whether you can actually retroactively pardon someone for any/all crimes without actually specifying what for and without that person actually having been found guilty is a bit unclear, though.
