rioted over the sale of bread
... that the residents of Ely, Cardiff, rioted over the sale of bread in 1991?
... that the residents of <a href="./Ely,_Cardiff" id="mwAts" rel="mw:WikiLink" title="Ely, Cardiff">Ely, Cardiff</a>, <b id="mwAtw"><a href="./Cardiff_Ely_bread_riots" id="mwAt0" rel="mw:WikiLink" title="Cardiff Ely bread riots">rioted over the sale of bread</a></b> in 1991?