The authorities in Brazil are investigating the purchase of vast estates close to its border with Paraguay by the Reverend Sun Myung Moon's Unification Church.
The church owns large amounts of property, including an entire town in Paraguay.
The area is notorious for smuggling and money laundering and Brazil's authorities are worried about a foreigner owning so much land in a border region.
Since the mid-1990's, the Reverend Moon's Unification Church has been buying up land both in Brazil and in Paraguay.
It now owns some two million acres in Brazil, a vast tract of farmland which has been called "New Hope Ranch."
But the authorities are worried that the holdings of the 82-year-old Korean multimillionaire, whose followers believe he is the latter-day Messiah, may be a threat to national security.
The area has long been a centre for massive smuggling and money-laundering operations.
The authorities are worried the church's lands could be used for people crossing the border without immigration controls.
Much of the land in Brazil was paid for in cash and the authorities are now investigating possible tax evasion and illegal currency transactions.
The church initially did all it could to get local support, holding regular barbecues for locals and giving out ambulances and other gifts.
But now the project is raising suspicion and the local state legislature has set up a commission to investigate Reverend Moon's activities.