CHICAGO — Deborah Bekken, a onetime Field Museum director, was calling powerful Chicago Alderman Edward Burke to ask for his support for the museum’s proposal for a fee increase in September 2017 when he caught her off guard with an immediately chilly demeanor. “Well, uh, I was surprised to hear from you — to be very frank,” a gruff-sounding Burke said to Bekken on the Sept. 8, 2017, call, .