Sean Kelly of Ireland was described in Willy Voet’s book ‘Massacre à la Chaine’: He won the Tour of Lombardy three times (1983, 1985, 1991 (also won amateur version in 1976)) and on at least one occasion he did it with the help of a corticoide injection. Kelly was controlled positive after Paris–Brussels in 1984 and that came as a surprise because he used the urine of a mechanic. But the mechanic was using a banned substance himself because he had to work long hours at night and needed the lift to stay awake."
To add, this is my favorite story on that list: