In general, concerted activity takes place when employees act as a group (in concert) for their mutual aid or protection. This includes activities like discussing the terms and conditions of their employment, such as pay, benefits, treatment by management, dress codes, workplace policies, or scheduling.
This activity—when engaged in by non-supervisory employees—is protected by Section 7 of the National Labor Relations Act. That means employers are legally prohibited from trying to stop employees from engaging in concerted activity or taking adverse action when they do. Click here to read more.