Larry Nassar has a new home ... a high-security federal penitentiary in Florida that's home to notorious mobster James "Whitey" Bulger.
Nassar was originally serving his 60 year federal sentence in Arizona ... but his attorney claims he was attacked in May only a few hours after being released into general population.
Officials transferred Nassar to a temporary facility in Oklahoma ... before sending him to Sumter County, Florida -- about 50 miles from Orlando.
USP Coleman II is a high security federal prison that holds about 1.