"Occasionally I saw these [genetically deformed] children in contaminated villages in the Mekong Delta; and whenever I asked about them, people pointed to the sky; one man scratched in the dust a good likeness of a bulbous C-130 aircraft, spraying." -John Pilger, war correspondent

"Monsanto covered up the dioxin contamination of a wide range of its products. Monsanto either failed to report contamination, submitted false information purporting to show no contamination or submitted samples to to the government for analysis which had been specially prepared so that dioxin contamination did not exist." -Cate Jenkins, EPA Regulatory Development Branch

Ah... where to begin?

Monsanto was the main manufacturer of Agent Orange, a herbicide used in Vietnam by the US military during the Vietnam War. Between 1961 and 1971, the American army sprayed areas of southern Vietnam with 79 million liters of Agent Orange. This was done with the aim of killing vegetation in the rainforest to allow the armed forces better visibility in seeing Vietcong resistance guerillas.

There are currently approximately 150,000 children in Vietnam whose parents allege that their birth defects are caused by exposure to Agent Orange during the war, or the consumption of dioxin-contaminated food and water since 1975 (Agent Orange contained dioxin). The Vietnamese government estimates that three million Vietnamese were exposed to these chemicals during the war, and that at least 800,000 suffer serious health problems today as a result. Many US war veterans have also been seriously affected by the chemical.

Presently, Monsanto is creating and aggresively marketing pesticides (ex. Roundup) and genetically modified seeds, as well as patenting living organisms. This has resulted in negative social and ecological consequences worldwide, such as drastic alteration of traditional livelihoods, loss of seed diversity, devaluation of women and men's knowledge, and ecological contamination. Ensuing revolts have occured worldwide, including in Vietnam.

Further reading:
http://www.inmotionmagazine.com/shiva.html
http://www.organicconsumers.org/monsanto/agentorange032102.cfm
http://www.corpwatch.org/article.php?id=11638
http://www.heureka.clara.net/gaia/orange.htm
http://en.wikipedia.org/wiki/Agent_Orange