Once the union won the support of a majority of the bargaining unit and is certified in a workplace, it has the sole authority to negotiate the conditions of employment. Under the NLRA, employees can also, if there is no majority support, form a minority union which represents the rights of only those members who choose to join. Businesses, however, do not have to recognize the minority union as a collective bargaining agent for its members, and therefore the minority union's power is limited. This minority model was once widely used, but was discarded when unions began to consistently win majority support. Unions are beginning to revisit the members-only model of unionism, because of new changes to labor law, which unions view as curbing workers' ability to organize.