In April 1949 the employment of thirty-two registered dock workers in London was terminated because they were regarded as ‘ineffective’, incapable physically of performing the job. Their redundancies were briefly resisted through strike action. This ended when the Labour government threatened to prosecute strike leaders. The episode highlighted the social construction of disability in workplaces, often seen as a pronounced feature of labour markets in periods of recession. Employers were seeking to disable impaired dockers because of fluctuating demand for labour in the Port of London. Public policy enabled this, despite the Labour government’s broader commitment to protecting working-class interests. Dockers opposed the thirty-two redundancies as a threatening precedent and also because they saw collective benefit in working alongside impaired individuals with valuable occupational knowledge. Dockers shared this understanding with other manual groups but resistance to the ineffective dismissals was also rooted in the peculiar history of the ports. Men deemed ineffective had endured a difficult employment and social environment, often for decades. Now they were denied the chief benefits of dock labour reform in the 1940s, with guaranteed income for registered men significantly higher than the statutory pensions for retired workers and compensation payments for the disabled.