Strikes generally take the form of a picket line. The workers walk in front of where they work, chanting and holding signs. Workers on strike usually do not stop people from crossing the picket line. However, some people will not cross a picket line to buy something from the company. This is a way of showing solidarity (or support) for the union. Most unions will also not cross a picket line and do business with companies on strike. For example, members of the Teamsters, a truck driving union, will not deliver to a business that is on strike. 