Groups of employees begin to congregate in unlikely places, scattering or ending their conversation when a supervisor or another manager appears. Employee behavior during meal and rest periods changes noticeably; instead of “hanging out,” some employees are obviously occupied with nonwork activity. Absenteeism increases significantly in a short period of time for no apparent reason. Groups of employees challenge supervisors or managers with questions about benefits and employment practices in an uncharacteristically antagonistic manner. Former employees or newcomers approach employees in the parking lot or at public entrances to the building. People are observed taking down license numbers on employee cars. Employees who normally hang out with one group of co-workers befriend others, jumping from one group to another during meal or rest periods. Union slogans in the form of graffiti begin to appear in locations where employees congregate.