Rumors of this have floated for years.
This isn’t really news, just news to some people.
I became a history student in 1976 after reading Anthony Brown’s “The Body Guard of Lies”. (made possible because of the Freedom of Information Act) I spent 10 years studying WWII sig-intel influence on that war. Am not an authority, but a student.
“Wild Bill Donovan” was first a patriot. He did have some “odd ducks” in the OSS, would have never betrayed his country. He probably did have contact with Wilheim Canaris, but was always an American Patriot.
I put little faith in tales of KGB exploits.