Before 1980 distance runners from western countries mostly believed that things like steroids would over build your muscles, add weight, and make you slower. There was no EPO and the closest thing to it for enhancing distance running performances was blood doping. Eventually the idea that steroids, HGH, etc. could help a distance runner by speeding up recovery and allowing you to train more and harder began catching on. It seems that Eastern Bloc coaches and athletes might have figured this out much sooner. Lots of people suspected that Kuts was taking something along those lines. The East Germans may have figured that out as well. But there were never stories about Soviet runners other than Kuts and I've never heard stories about DDR runners other than Cierpinski.