The campaign is organized by the Bhopal Medical Appeal, London Mining Network and UK Tar Sands Network, among other groups.

FORBES: Olympic Protesters Target Dow's $100 Million Sponsorship

The Bhopal Medical Appeal, which funds clinics in Bhopal, believes that Dow, which bought Union Carbide in 1999, should pay to clean the site and supply funds for victims.

FORBES: Olympic Protesters Target Dow's $100 Million Sponsorship