Section 2 of Chapter 151 of the General Laws is hereby amended by striking out the seventh paragraph and inserting in place thereof the following section:-

''Occupation'', an industry, trade or business or branch thereof or class of work therein, whether operated for profit or otherwise, and any other class of work in which persons are gainfully employed, but shall not include professional service, agricultural and farm work, work by persons being rehabilitated or trained under rehabilitation or training programs in charitable, educational or religious institutions, work by seasonal camp counselors and counselor trainees, work by members of religious orders, or seasonal volunteer ski patrollers and seasonal volunteer ambassadors or hosts. Occupation shall also not include outside sales work regularly performed by outside salesmen who regularly sell a product or products away from their employer's place of business and who do not make daily reports or visits to the office or plant of their employer.