The Conspiracy and Protection of Property Act, 1875 super seded the Criminal Law Amendment Act of 1871 which had been opposed by the trade unions and which had proved to be an in strument of coercion. It laid down that an agreement or combina tion by two or more persons to do or procure to be done any act in contemplation or furtherance of a trade dispute should not be indictable as a conspiracy if such act committed by one person would not be punishable as a crime. The act legalised peaceful picketing and cases of intimidation or violence were to be left to the courts of summary jurisdiction.
The nineties also saw the spread of trade unionism to the black-coated workers. The National Union of Clerks came into existence in 189o, followed shortly by the Shop Assistants' Union and the Amalgamated Union of Co-operative Employees.
Trade Union Membership, From 1892 onwards the progress of trade unionism can be traced statistically (see the table). The depression of trade, 1892 1895, brought with it, as usual, some decline in trade unionism; but though many of the "new unions" collapsed, some of the more important have survived to the present time. The revival of trade which began in 1896 was naturally accompanied by an increase in the strength of trade unions; but the most marked characteristic of this period was the extension and consolidation of employers' associations, of which perhaps the most notable is the Engineering Employers' Federation, which was originally formed on the Clyde, but gradually extended to other districts and became a national organisation of great strength during its successful struggle with the Amalgamated Society of Engineers in 1897-1898. Among the other more important Employers' Asso
ciations and federations of a national character may be men tioned the Shipping Federation, the Mining Association, the Shipbuilding Federation, the Federation of Master Cotton-Spin ners' Associations, the National Federation of Building Trade Employers, and the Incorporated Federated Associations of Boot and Shoe Manufacturers.
At the beginning of the loth century the trade union move ment was fairly established. The local trade clubs had given way to national organisations of considerable size and unions existed for practically every type of worker. The opening years of the century prior to the outbreak of the World War saw a considerable expansion of trade unionism. The number of trade unionists doubled between 190o and 1913.