The term "professional" is widely used to refer to individuals with recognized expertise within a field of endeavor even though they are not a member of a licensing body or legal entity. The distinction between professional sports and amateur sports simply refers to how the athlete is funded. Similarly the distinction within creative pursuits between professional and amateur becomes somewhat grey.
Historically, behaving professionally would indicate that the person's actions remain in accordance with specific rules, written or unwritten, pertaining to behavior, dress, speech, etc. By extension, the adjective professional identified somebody recognized for expertise or skill in a craft or activity.
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Professional :: Organizations
Unions :: Labor Movement

Fraternal Association of Professional Paramedics, Local 22 - Southwestern Pennsylvania chapter of this organization representing prehospital care providers. Information on other local units.
Fraternal Order of Firefighters - Chattanooga - Tennessee, USA. Promoting professional firefighters and supporting charities in the Tennessee, Alabama, Georgia tri-state area.
Meta Description: [ Fraternal Order of Firefighters website based in Chattanooga, Tennessee ]
International Brotherhood of Magicians - The world's largest fraternity for amateur and professional magicians, magic enthusiasts and collectors of magic apparatus.
Polish American Police Association - National organization started in 1964 in Chicago, IL.
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