Professional matches in Greco-Roman wrestling were known for their great brutality. Body slams, choke-holds, and head-butting was allowed, and even caustic substances were used to weaken the opponent. By the end of the 19th century, gouging with the nails, punching, and violently slamming the arms together around the opponent's stomach were forbidden. Greco-Roman matches were also famous for their length. Professionally, it was not uncommon for there to be matches lasting two or three hours. William Muldoon's bout with Clarence Whistler at the Terrace Garden Theater in New York lasted eight hours before ending in a draw. Even in the 1912 Olympics, a match between Martin Klein of Russia (Estonia) and Alfred Asikainen of Finland lasted for eleven hours and forty minutes before Martin Klein won. He got automatically silver medal because he was too tired to compete in final match next day. That record was later published at "Guinness World Records". The International Amateur Wrestling Federation (IAWF) took over the regulation of Greco-Roman wrestling in 1921. Since then matches have been dramatically cut short, and today all movements that put the life or limb of the wrestler in jeopardy are forbidden.