90 years ago today, Alcatraz opened its doors to its first inmates, who had previously stirred up trouble all over America.
It was initially designed as a naval defense fort, but in 1861 it was repurposed to house military offenders, and in its early years, it saw a diverse group of prisoners.
For more about that KCBS Radio's Liz Saint John spoke with John Martini Historian and former Park Ranger at Alcatraz.