High Quality Content by WIKIPEDIA articles! William Thompson (1775 – 28 March 1833) was an Irish political and philosophical writer and social reformer, developing from utilitarianism into an early critic of capitalist exploitation whose ideas influenced the Cooperative, Trade Union and Chartist movements as well as Karl Marx. Born into the Anglo-Irish Ascendancy of wealthy landowners and merchants of Cork society, his attempt to will his estate to the cooperative movement after his death sparked the longest court case in Irish legal history as other branches of his family fought to have the will annulled.