A mass tort is a civil action involving numerous plaintiffs against one or a few corporate defendants. The tort may involve, for example, personal injuries suffered by numerous plaintiffs as a result of a defective product, or a mass disaster in which there were many injured persons, such as an airplane crash, or exposure of a large group of people to toxic chemicals or pharmaceuticals.
Waterloo is in the county seat of Black Hawk County, Iowa, United States. As of the 2000 census, the city had a total population of 68,747, with an estimated population of 66,662 in 2008. It belongs to the Waterloo-Cedar Falls Metropolitan Statistical Area, and is the larger of the two cities, by population.