Final answer:
The scenario with different unions representing physical therapists, nurses, and pharmacists within the same agency is an example of occupational unionism, which refers to unions specific to professions or crafts.
Step-by-step explanation:
In the scenario described, we are dealing with a case in which physical therapists, nurses, and pharmacists are each represented by their own respective unions within a single agency. This type of union representation where different occupations have distinct unions is known as occupational unionism. Occupational unionism focuses on the representation and collective bargaining for workers within a specific profession or craft, as opposed to industrial unionism which organizes all workers in an industry regardless of their particular job.
Labor unions play an integral role in enhancing workers' conditions by engaging in collective bargaining and, on occasion, strikes. They advocate for higher wages, improved working conditions, and more robust benefits. While union membership has seen a decline in recent decades, their influence can be seen in historical legal reforms that have improved workers' rights and work conditions.