The fellow in the dark suit in photo no. 1 is Ralph Byrd, who was famous for portraying comic strip hero Dick Tracy in movies and TV shows. However, I believe this still is from one of his early serials "S O S Coast Guard" from 1937. I found this photo from the movie serial. I believe the stripes and insignia on the sleeve match in the two photos.
The actress is Maxine Doyle. Bela Lugosi played the villain.
I thought that was Ralph Byrd! I couldn't find any photos to match up with it, though.
Good job, Miles.