Inspired by reading King Leopold's Ghost, which compares the Belgian genocide in late 1800's-early 1900's Congo to the Soviet Gulags, and then reading Imperial Reckoning, which compares the British torture camps in 1950's Kenya to the Soviet Gulags, and also by reading Golden Gulag, which compares mass incarceration in California to, you guessed it...
Ruth Wilson Gilmore, author of Golden Gulag