As the Beacon and others are reporting Oberweis questioned about immigrant workers. It will be interesting to watch the response on this by his campaign. It's not like this should be a big surprise to him and his people that at some point someone was going to come after him on this. The dairy operation is a big company and the odds are there might be someone will immigration issues working there.
The organization that helped filed the complaint as some information about it here.
The article mentions a written statement from the campaign that I can't seem to find. They need to come up with a better response than 'smear campaign' (it sound whiney). They also fail to address the real issue with the complaint for a lot of people, not the immigration status, but the wage issue.
People can understand that you hired a company to clean the stores and they hired undocumented workers. The issue with some people is going to be that they didn't even make minimum wage.