How was Stephenson in a position to learn about German technology and weapons prior to World War II?

Why was there some suspicion of United States Ambassador Joseph P. Kennedy in London? What was the cause of the look at the United States Embassy?

Why did Stephenson set up the BSC in New York in the United States? What was its purpose?

What was the FANY? What was its purpose? Who was Madeleine?

Why didn't Stalin believe Russia was going to be invaded? Why didn't the British share how they got their intelligence even though they warned him?

What was Stephenson's and the British hope for one intelligence agency? Why didn't it happen?

In looking at the different steps and operations, such as JUBILEE, in the planning for the D-day invasion, did the end justify the means?