All-in wrestling was the first wave of professional wrestling in the United Kingdom to be based on the catch as catch can style of wrestling. It was conducted under the All-In rules of 1930 in which (unlike Olympic freestyle wrestling) no holds were prohibited. The name All In later became synonymous with more anarchic professional wrestling shows, leading to censure by local authorities by the late 1930s. Consequently, the All In label was disowned by most British wrestling promoters following the adoption of the 1947 Mountevans rules.