CHICAGO -- A controversial art exhibit in Chicago drew some startling visitors last week -- two U.S. Secret Service agents.

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The exhibit, perhaps the most controversial display at Columbia College's Glass Curtain Gallery, opened Thursday night. NBC5's Darren Kramer reported that the federal agents arrived 10 minutes after the exhibit opened.

Among the pieces on display, "Patriot Act" is a sheet of mock U.S. stamps showing President George W. Bush with a gun to his head.

Kramer said the agents wanted the names and phone numbers of the artists at the show, titled "Axis of Evil -- The Secret History Of Sin."

Michael Hernandez de Luna, the curator of the show, said that he and his attorneys had not determined whether they would comply with the Secret Service's request.

"This affects me as an artist and it affects the 47 artists who are on the walls," Hernandez de Luna said.

Al Brandtner, the Chicago artist who made "Patriot Act," could not be reached for comment.

The artists featured in the show are not connected to the college.

A college spokesman said the school supports freedom of expression, and the exhibit is doing precisely what it's supposed to do, cause people to think and talk about the work.