The Shadow radio dramas ran from 1937 to 1954. The voices of the main characters, Lamont Cranston and Margo Lane, changed over the years:
(Information for 1950 to 1954 is a difficult to find, which is why those years are not listed here)
As with most radio programs of the day, the emphasis of the show was on American patriotism and fulfilling the proper roles in society. Remember, Crime does not pay! The main advertisers of the Shadow radio program were the Blue Coal Company, and the Carey Salt Company.
Some of the broadcasts survive to this day on the web. One place that has a nice little archive of the broadcasts is the Cobalt Club (which, if anyone watched the 1994 movie with Alec Baldwin, was the name of the dinner lounge Lamont patronized). http://testbox.cob.rit.edu/