Two parts of interest that jumped out to me:

> The overlapping accounts expose frictions between the two partners over money, control and ethical limits, with the West Germans frequently aghast at the enthusiasm with which U.S. spies often targeted allies.

> Hagelin had once hoped to turn control over to his son, Bo. But U.S. intelligence officials regarded him as a “wild card” and worked to conceal the partnership from him. Bo Hagelin was killed in a car crash on Washington’s Beltway in 1970. There were no indications of foul play.