From ANIMAL PEOPLE, December 2000:

Tanzania is hub of baboon traffic

ARUSHA, Tanzania--Growing global concern about the decline of
primates in the wild and the possibility of more stringent regulation of
primate exports has coincided with a flurry of primate sales to
laboratories by African and Asian dealers whom some sources liken to bar
patrons rushing to grab one last drink "for the road" at closing time.
One apparent hub of the traffic, especially in wild-trapped
baboons, is Arusha, Tanzania, located near the Kenya border with paved
road access to international airports at Nairobi and Mombasa in Kenya, as
well as the Tanzanian capital of Dar es Salaam.
Most of the baboons went to the U.S. via Kenya until March 2000,
according to the British Union for the Abolition of Vivisection. The Kenya
Wildlife Service embargoed baboon exports and revoked the permits of dealer
Richard Mann, who had been the only licensed exporter, after finding more
than 100 baboons in miserable condition at Mann's Nairobi warehouse.
Mann has reportedly been unable to get a permit to move his
operations to Tanzania. Fully identifying all of the Tanzanian dealers can
be difficult, however, even with copies of their Primate Supply
Information Clearinghouse 2001 listings in hand. Paradise Exports, for
instance, of P.O. Box 7522, Arusha, Tanzania, names no personnel, gives
no street address, offers a fax address in Britain which cannot be traced,
and has a Yahoo e-mail account, which could originate from anywhere in
the world.
ANIMAL PEOPLE learned that investigators for at least three
different animal protection groups believe Paradise Exports is owned by a
Tanzanian baboon trapper who may be working in association with convicted
American primate smuggler Matthew Block.
Coincidentally, Animal Welfare Institute executive director Cathy
Liss recognized Block engaged in conversation with Jim Sears of Three
Springs Scientific Inc. in the vendors' area at the November 5-9 American
Association of Laboratory Animal Science conference in San Diego. Liss
exposed Block's history on the spot in a public announcement.
What business Block may have had at the conference remained unclear.