Though legal, derecognition (UK) or decertification (US) of a trade union may be referred to as union busting by trade unions, even when it is initiated by members of the union. Derecognition/decertification must be accomplished according to statutory guidelines. Workers in the UK may derecognize a union which no longer has support from members or if union membership falls below 50%. Employers may derecognize a union if they no longer employ 21 or more workers. Generally in the UK an application for derecognition must be made to the CAC or Central Arbitration Committee which declares that a derecognition/decertification ballot election will be held. However a company may decide to unilaterally derecognize, as long as it has a non-CAC recognition agreement in force.