"I want to warn against the Fifth Column which is trying to hinder our free way of life in Holland"

In this quote, Theo Van Gogh is expressing his concern about a group called the "Fifth Column" that is actively working to impede the liberty and lifestyle in Holland. The term "Fifth Column" refers to a group of people within a nation who secretly work against their own federal government or society, typically in collaboration with an enemy force. Van Gogh is warning versus the destructive actions of this group, which he thinks are threatening the essential values and liberties of the Dutch individuals. He is urging his fellow residents to be watchful and stand up against this hazard to their lifestyle.