Volunteers with the LaRouche Political Action Committee set up a booth in front of the Winnetka Post Office Tuesday, decked out with political fliers, pamphlets and posters.

The man and woman, who declined to give their names, said they travel to Midwest cities to set up their booth in front of post offices. They choose post offices because the property is public and does not interfere with local businesses, the woman said.

However, some of the posters and literature, which called for the impeachment of President Obama and depict him with Hitler's mustache superimposed, offended some passers-by who contacted Winnetka police. The police defended the group's right to be there, the volunteers said.

"This is free speech," the woman said.

The volunteers said they live in the area, and the man grew up on the North Shore. Response to their presence has varied, the woman said.

"Some people have said, 'I love it, you've made my day' and on the other side, there've been people who were angry and said, 'I'm calling the police,' " she said.

The representatives said the goal of the booth is to educate the public and encourage voters to call on lawmakers to reinstate provisions of the Glass-Steagall Act, also known as the Banking Act of 1933.

The act was passed in the midst of bank closures and economic instability during the Depression. It created the Federal Deposit Insurance Corporation and established some separation between investment banks and depository banks. Over the years, certain parts of the act were repealed and in 1999, Congress passed the Gram-Leach-Bilely Act that ended many of the separations between depository banks and securities firms.

For a timeline on the history of the Glass-Steagall Act by PBS' Frontline, click here.

"Our mission today is for every congressman to get a call every day, every hour, ever minute telling them to stay in session, to not come home, until they pass the Glass-Steagall Act," the woman said. "As long as it's not passed, they will continue to bail out the banks.

The representatives said they would be outside the post office until it closes at 5:30 p.m.