Anti-union organizations played increasingly prominent roles in American politics. In April 1903, David M. Parry spoke to the annual convention of the National Association of Manufacturers (NAM), delivering a speech critical of organized labor, asserting that trade unionism and socialism differ only in method, with both aiming to deny "individual and property rights". Parry asserted the natural laws which governed the nation's economy, and he decried any interference with those laws, whether by legislative or other means. Parry asserted that the goals of the unions would inevitably lead to "despotism, tyranny, and slavery", and the "ruin of civilization."