Just hit me...Federal building are some of the most secure places....They have securty check at all entrances....Fed Officers on duty. FBI agents, court LEO etc. Hell she doesn’t need security in a federal facility, and certainly not five agents....They were taking her somewhere she had not willingly complied to.
The video at link says they appear to be Secret Service agents.
http://www.myfoxchicago.com/dpp/news/metro/valerie-jarett-dirksen-blagojevich-rahm-emanuel-20101001
(Perhaps she has made some enemies in Chicago?)