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The American Psychiatric Association is the main professional organization of psychiatrists and trainee psychiatrists in the United States, and the largest psychiatric organization in the world.

The American Occupational Therapy Association is the national professional association established in 1917 to represent the interests and concerns of occupational therapy practitioners and students and improve the quality of occupational therapy services.

The National Postal Mail Handlers Union is a progressive Labor Union representing more than 50,000 Mail Handler craft members in United States Postal Service facilities across the United States.