The Royal Dutch Cycling Union or KNWU (in Dutch: Koninklijke Nederlandsche Wielren Unie) is the national governing body of cycle racing in the Netherlands.
The KNWU is a member of the UCI and the UEC

Source: Wikipedia

Union Cycliste Internationale (UCI)

UCI is a professional cycling union that oversees competitive cycling events in the international community. It is the world governing body for jurisdiction in the sport of cycling. The UCI is headquartered in Aigle, Switzerland. The English translation is the International Cycling Union.

The UCI issues racing licenses to riders and enforces disciplinary rules, such as in matters of doping. The UCI also manages the classification of races and the points ranking system in various cycling disciplines including mountain biking, road and track cycling, for both men and women, amateur and professional. It also oversees the World Championships – in which different countries compete instead of trade teams – in various disciplines and in different categories. The winners of these races have the right to wear a special rainbow jersey for the following year, and have the right to wear the same rainbow pattern on their jersey collar and cuffs for the remainder of their careers.

Source: Wikipedia