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The term that refers to a work stoppage induced by employees voluntarily refusing to work is a strike. Strikes are typically organized by labor unions to protest employment conditions, wages, or other workplace issues. By collectively deciding to cease work, employees aim to exert pressure on their employer to negotiate better terms or to highlight their grievances.

In contrast, the other options present different concepts: intervention typically involves mediating in disputes, often to resolve conflicts without halting work. Unionization refers to the process of forming or joining a labor union, which is a significant step leading to actions like strikes but does not imply a stoppage of work itself. A boycott involves consumers refusing to purchase goods or services from a business, which is essentially a protest tactic aimed at the employer rather than an action taken by employees regarding their own work conditions. Thus, a strike is the correct term that directly corresponds to the situation described in the question.