like Frank Duk and bloodsport
There have been underground illegal no hold bar fights going on for years with no weight divisions - Lenny McLean anyone? But to put on an event like that in the US 1970 and for it to be legal and allowed there would have to be rules to adhere to. Kickboxing was an easy way to go as boxing was legal and a popular sport for many years. As we know, Bruce had already fought in boxing as a teenager in HK.