I came across Anthony Karen's work through NPR's website, on which he's described as having made a career out of breaking into secret circles from Voodoo rituals in Haiti to white-robed Ku Klux Klan initiations in the South of the US.
Indeed the work on his website centers around what he calls "intimate images of taboo people doing taboo things". His images are of swastika-clad families at the annual Nordic Fest gathering of white nationalists, Haitian Voodoo priests beheading goats and, even "Brother Number 3," a former official in the brutal Khmer Rouge regime hiding out in Cambodia before his 2007 arrest.
There are two links for Anthony Karen that are recommended: his website, and his interview with NPR which includes audio.
