A leading feature of this Trade Unionist revival was a dogged resistance to legal oppression. Although the more sensational prosecutions of Trade Union leaders had ceased with the abandonment of unlawful oaths, there was still going on, up and down the kingdom, an almost continuous persecution of the rank and file, by the magistrates’ interpretation of the law relating to masters and servants. The miners, in particular, were hampered by lengthy hirings, during which they were compelled to serve if required, but were not guaranteed employment. Unskilled in legal subtleties, and not yet served by an experienced class of Trade Union secretaries, they were made the victims of a thousand and one quibbles and technicalities. The Northumberland and Durham Miners’ Union grappled with the difficulty in a thoroughly practical spirit. They engaged W. P. Roberts,[312] an able and energetic solicitor, with strong labour sympathies, to light every case in the local courts. In 1844 the Miners’ Association of Great Britain and Ireland followed this excellent example by appointing Roberts their standing legal adviser at a salary of £1000 a year. When the Durham miners had to relinquish his services at the end of 1844, he was taken over by the newly formed Lancashire Miners’ Union. The “miners’ attorney-general,” as he was called, showed an indefatigable activity in the defence of his clients, and was soon retained in all Trade Union cases. The magistrates throughout the country found themselves for the first time confronted by a pertinacious legal expert, who, far more ingenious than the employers, was not less unscrupulous in taking advantage of every technicality of the law.