Question: Professional motorcross racer Neil Hudson won the 1981 250cc premier championship organized by what group?

Documents:
source: Motocross World Championship
text: Motocross World Championship FIM Motocross World Championship is the premier championship of motocross racing, organized by the Fédération Internationale de Motocyclisme (FIM), currently divided into two distinct classes: MX1 and MX2. Race duration is 30 minutes plus 2 laps per moto. The series runs 18 events with two motos at each round.

source: Neil Hudson
text: Neil Hudson Neil Hudson (Born 24 January 1957) is an English former professional motocross racer. He won the 1981 250cc Motocross World Championship.

source: List of Grand Prix motorcycle racing winners
text: List of Grand Prix motorcycle racing winners Grand Prix motorcycle racing is the premier championship of motorcycle road racing, which has been divided into three classes since 1990; 125cc, 250cc and MotoGP. Former classes that are now discontinued include 350cc, 50cc and sidecars. The premier class is MotoGP, which was formerly known as the 500cc class. The Grand Prix Road-Racing World Championship was established in 1949 by the sport's governing body the Fédération Internationale de Motocyclisme (FIM), and is the oldest motorsport World Championship in existence. The motorcycles used in MotoGP are purpose built for the sport, and are unavailable for purchase by the general public: they cannot be legally ridden on public roads.

source: List of 250cc/Moto2 Motorcycle World Champions
text: List of 250cc/Moto2 Motorcycle World Champions Grand Prix motorcycle racing is the premier championship of motorcycle road racing, which has been divided into three classes since 1990: 125cc, 250cc and MotoGP. Former classes that have been discontinued include 350cc, 50cc/80cc and Sidecar. 250cc is the intermediate category; the 250cc refers to the size of the engines of the motorcycles that race in that class. The engines have twin cylinders, as opposed to the four cylinders used in MotoGP. The Grand Prix Road-Racing World Championship was established in 1949 by the sport's governing body, the Fédération Internationale de Motocyclisme (FIM), and is the oldest motorsport World Championship. The 250cc class was replaced in 2010 by a new class called Moto2. The 250cc engines were replaced by 600cc engines, which were supplied by Honda to all teams.

source: List of 125cc/Moto3 Motorcycle World Champions
text: List of 125cc/Moto3 Motorcycle World Champions Grand Prix motorcycle racing is the premier championship of motorcycle road racing, which is divided into three classes: Moto3, Moto2 and MotoGP. Former classes that have been discontinued include 350cc, 250cc, 125cc, 50cc/80cc and Sidecar. Moto3 replaced the 125cc class in 2012. Moto3 runs 250cc single-cylinder engines as opposed to the 125cc engines used previously. The engines have single cylinders, as opposed to the four cylinders used in MotoGP. Moto3 is the class where young riders first participate in Grand Prix motorcycle racing. The minimum age for a rider is 16 years and the maximum is 28 years. The Grand Prix Road-Racing World Championship was established in 1949 by the sport's governing body, the Fédération Internationale de Motocyclisme (FIM), and is the oldest motorsport World Championship.

source: List of 50/80cc Motorcycle World Champions
text: List of 50/80cc Motorcycle World Champions Grand Prix motorcycle racing is the premier championship of motorcycle road racing, which has been divided into three classes since 1990: 125cc, 250cc and MotoGP. Classes that have been discontinued include 350cc, 50cc/80cc and sidecar. The 50/80cc referred to the size of the engines of the motorcycles that raced in that class. The Grand Prix Road Racing World Championship was established in 1949 by the sport's governing body, the Fédération Internationale de Motocyclisme (FIM), and is the oldest motorsport World Championship. The 50cc was introduced in 1962, 13 years after the start of the first world championships. The category was replaced by 80cc in 1984 and the class was subsequently discontinued in 1989.

source: Hideo Kanaya
text: Hideo Kanaya Hideo Kanaya (Shinjitai: 金谷 秀夫 , Hideo Kanaya , February 3, 1945 – December 19, 2013) was a Grand Prix motorcycle road racer from Japan. Kanaya began his Grand Prix career in 1967 and won his first Grand Prix at the 1972 250cc German Grand Prix. In 1972, Kanaya and Jarno Saarinen raced the first four-cylinder, two-stroke Yamaha TZ 500 in the 500cc world championship. After Saarinen's death in the 250cc race at the Italian Grand Prix at Monza, the TZ 500 project was put aside and Kanaya raced only in the 250cc class. Kanaya's best season was in 1975, when he finished third in the 500cc world championship behind his Yamaha team-mate, Giacomo Agostini and MV Agusta's Phil Read. He also won the Macau Grand Prix in 1975.

source: List of 350cc Motorcycle World Champions
text: List of 350cc Motorcycle World Champions Grand Prix motorcycle racing is the premier championship of motorcycle road racing, which has been divided into three classes since 1990: 125cc, 250cc and MotoGP. Classes that have been discontinued include 350cc, 50cc/80cc and sidecar. The Grand Prix Road-Racing World Championship was established in 1949 by the sport's governing body, the Fédération Internationale de Motocyclisme (FIM), and is the oldest motorsport World Championship. The 350cc class existed from 1949 until 1982. The 350cc referred to the size of the engines of the motorcycles that participated in the class. The engines had four cylinders, similar to the types of engines used in MotoGP today.

source: List of 500cc/MotoGP Motorcycle World Champions
text: List of 500cc/MotoGP Motorcycle World Champions Grand Prix motorcycle racing is the premier championship of motorcycle road racing, which has been divided into three classes since 1997: 125cc, 250cc and MotoGP. Former classes that have been discontinued include 350cc, 50cc/80cc and Sidecar. The premier class is MotoGP, which was formerly known as the 500cc class. The Grand Prix Road-Racing World Championship was established in 1949 by the sport's governing body, the Fédération Internationale de Motocyclisme (FIM), and is the oldest motorsport World Championship in existence. The motorcycles used in MotoGP are purpose built for the sport, and are unavailable for purchase by the general public because they cannot be legally ridden on public roads. From the mid-1970s to 2002, the top class of GP racing allowed 500cc with a maximum of four cylinders, regardless of whether the engine was a two-stroke or four-stroke. Rule changes were introduced in 2002, to facilitate the phasing out of two-stroke engines.

source: I'm Never Afraid!
text: I'm Never Afraid! I'm Never Afraid! (Dutch: "Ik ben echt niet bang!") is a 2010 Dutch Super 16mm documentary film about Mack Bouwense an eight-year-old professional motorcross racer who has a mirrored heart, a condition known as dextrocardia. It is directed by award winning Dutch filmmaker Willem Baptist and broadcast by VPRO on 20 November 2010. In German and French speaking countries the documentary was broadcast by ARTE.

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Answer: Fédération Internationale de Motocyclisme