The drink's coca flavoring, and the nickname "Coke", remain a common theme of criticism due to the relationship with the illegal drug cocaine. In 1911, the US government seized 40 barrels and 20 kegs of Coca-Cola syrup in Chattanooga, Tennessee, alleging the caffeine in its drink was "injurious to health", leading to amended food safety legislation. Beginning in the 1940s, Pepsi started marketing their drinks to African Americans, a niche market that was largely ignored by white-owned manufacturers in the US, and was able to use its anti-racism stance as a selling point, attacking Coke's reluctance to hire blacks and support by the chairman of The Coca-Cola Company for segregationist Governor of Georgia Herman Talmadge. As a result of this campaign, Pepsi's market share as compared to Coca-Cola's shot up dramatically in the 1950s with African American soft-drink consumers three times more likely to purchase Pepsi over Coke. The Coca-Cola Company, its subsidiaries and products have been subject to sustained criticism by consumer groups, environmentalists, and watchdogs, particularly since the early 2000s. In 2019, BreakFreeFromPlastic named Coca-Cola the single biggest plastic polluter in the world. After 72,541 volunteers collected 476,423 pieces of plastic waste from around where they lived, a total of 11,732 pieces were found to be labeled with a Coca-Cola brand (including the Dasani, Sprite, and Fanta brands) in 37 countries across four continents. At the 2020 World Economic Forum in Davos, Coca-Cola's Head of Sustainability, Bea Perez, said customers like them because they reseal and are lightweight, and "business won't be in business if we don't accommodate consumers." Coca-Cola Classic is rich in sugar (or sweetners in some countries) especially sucrose, which causes dental caries when consumed regularly. Besides this, the high caloric value of the sugars themselves can contribute to obesity. Both are major health issues in the developed world. In July 2001, the Coca-Cola company was sued over its alleged use of political far-right wing death squads (the United Self-Defense Forces of Colombia) to kidnap, torture, and kill Colombian bottler workers that were linked with trade union activity. Coca-Cola was sued in a US federal court in Miami by the Colombian food and drink union Sinaltrainal. The suit alleged that Coca-Cola was indirectly responsible for having "contracted with or otherwise directed paramilitary security forces that utilized extreme violence and murdered, tortured, unlawfully detained or otherwise silenced trade union leaders".