Unions can form in any business with more than one employee. Understanding how to effectively and legally deal with a union can be an important part of running a business. The NLRA is designed to define and protect the rights of employers and employees, to encourage collective bargaining and to prevent certain unfair labor practices. The NLRA does not cover all of your employees. In addition, a single employee cannot form a union.
Employees form unions by creating bargaining units.
A bargaining unit is a group of employees who perform the same type of work or work in the same location. To be official, the NLRB must approve a bargaining unit. Once a union is formed, employees have the right to bargain collectively with their employer and strike for lawful purposes. Among other things, employers may not interfere with employees' union rights or discriminate against employees for engaging in protected activity. Unions cannot discriminate against employees or refuse to bargain in good faith.