Getting involved with professional associations in your area of interest is a great way to:
become informed about resources in a particular career field
search job posting boards (many prof. associations have their own, well-developed job posting boards online)
get connected with people in the profession
understand current issues in your career
There are a few different ways to find which professional associations are affiliated with your area of interest/career field:
Visit the Occupational Outlook Handbook, search for a specific job title, then scroll all the way to the bottom or click on SOURCES OF ADDITIONAL INFORMATION