Workers defeated the leaving-certificate wage cap through union revolt.

Evidence

Th e rank and fi le all over the country revolted against a measure that tied the hands of the employee but not the employer, who was left free to fi re his workers and was not compelled to issue a certifi cate even once he fi red them. Th rough union bargaining, the certifi cates were repealed in October 1917. — Clara E. Mattei, The Capital Order, 177

Categorization

• CANDY: A neat, self-contained nugget: workers crushed a ‘slavery clause’ wage-control mechanism in 1917 Britain — good elevator material on labor history.
• XREF: connects to: Workers’ revolt repealed Britain’s one-sided leaving certificate system. — Clara E. Mattei, The Capital Order: How Economists…, 177