It was good, wasn't it? There's a video somewhere on youtube which shows him throwing a right hand that I had to rewind and watch about 15 times.
To the amazing Cubans already added I'd like to add my personal favourites: Nikolay Korolev (Heavyweight 1930s-1950s): Multiple times Soviet champion. Fearless special forces hero who went through WWII behind enemy lines from the first day to the last day. He was offered to fight Joe Louis, but was prevented from doing so by the Soviet government. He put up a fight against this, making the fight with Louis the meaning of his life, writing to Stalin, Malenkov, Beriya and lots of other powerful people, but eventually got shut down and shunned. Trully a great man, and from what I had seen, he had a very good chance against Louis if he got a bit of pro experience. Olympic Champion Valeri Popenchenko (the guy in my avatar) - Middleweight. 1964 Olympic Champion, first Soviet to get the Val Barker trophy. 2x European Champion Multiple times Soviet Champion He was a skilled boxer known as Mr. Knockout for his tremendous punching power, which allowed him to stop many of his opponents. Was also a brilliant mathematician and physicist who did some work in military technology (he was in the navy). Both of these guys would have made great pros. They were not only skilled, but also extremely tough, and they had a power-punching style rather than the point-scoring amateur style that doesn't always convert well to the pro game.
Israel Acostas(484-16) - our boxing trainer here in milwaukee 500 amateur fights he won 484 and only lost 16 of them. His dream was to go to the Olympics and easily win the gold, the year Carter pulled out of the olympics because of the BS politics. The 3 men that won the Gold/Silver/Bronze that year were all previously defeated by Acostas...He would have been a god at 106lbs http://findarticles.com/p/articles/mi_qn4207/is_19950408/ai_n10192172