Durban — Extortion by criminal networks in the construction sector known as the construction mafia is expected to be at the centre stage at the construction summit which will take place in Durban on Tuesday (today).The Summit on Crime-Free Construction Sites organised by the Department of Public Works and Infrastructure (DPWI), in collaboration with the SAPS and the Construction Industry Development Board (cidb), is a direct response to the extortion crime which has wreaked havoc in the country.Although it has been prevalent in the construction and taxi industries, this crime has…