Lance Armstrong

Lance Armstrong remains the most divisive figure in cycling history: a cancer survivor who won seven consecutive Tour de France titles before being unmasked as the architect of a doping conspiracy that cost him all his victories. His Livestrong Foundation raised nearly $500 million for cancer research, yet his systematic use of EPO and blood transfusions—uncovered by a 2012 USADA report—led to a lifetime ban and stripped him of every major accolade. The scale of his organized cheating—involving team doctors, sophisticated masking agents, and intimidation of accusers—set a benchmark for betrayal that outpaces any other figure on this list.