Amalgamated Association of Operative Cotton Spinners Tags: Trade Union.The Amalgamated Association of Operative Cotton Spinners and Twiners also known as the Amalgamation was a trade union in the United Kingdom which existed between 1870 and 1970. It represented male mule spinners in the cotton industry. affiliation Trades Union Congress, General Federation of Trade Unions (United Kingdom) country United Kingdom Learn more... Loading...