Oh come on...there were antiNazis working right under Hitler's nose and Russians working secretly in the USSR. Just have an open mind. :-)
There were anti Nazis that were quite well known to Roosevelt. And he refused to even speak with them (despite their many attempts to speak with him) or even acknowledge they existed. And they were high level German military men! And thus thousands of American military men died that didn't have too. And maybe millions of Jews, Gypsies, Poles, and others could have been saved as well.
As for Russia under Stalin- I am aware of no leaders or groups that were anti Stalin as to be such was death. Iraq had no such groups either. Are we "creating them" now?