johannesburg south african deputy president cyril ramaphosa lead contender become head rule anc december step criticism government sunday say state-owned company capture fund loot ramaphosa remark speech african national congress meet old diamond-mining town kimberley tough others make government graft signal issue main theme campaign also take aim without name wealthy gupta family friends president jacob zuma accuse use undue influence win lucrative state contract zuma guptas deny wrongdoing many state-owned enterprises capture certain people certain family ramaphosa say state-owned enterprises capture say want see end state capture money steal want back say roar approval audience south africa top prosecutor say wednesday police examine trove leak document detail relations guptas zuma early say prosecution launch ramaphosa say may south africa danger become mafia state take swipe july guptas media report state fund divert 2013 pay lavish gupta family wed sunday remark certain family point come race heat anc top spot next head party select december presidential candidate 2019 national elections ramaphosa main challenger veteran politician zuma ex-wife nkosazana dlamini-zuma next week swear member parliament move could see former minister bring back cabinet raise profile analysts say back zuma well-established patronage network well organizations party women league ramaphosa trade unionist-turned-business tycoon back diverse group unions communists investors always see eye eye want rid anc zuma influence legacy opposition long accuse zuma sleaze influence-peddling office survive no-confidence vote parliament aug. 30 anc lawmakers vote opposition indicate deep divisions party dominate south african politics since end apartheid 1994. south africa 's ramaphosa step criticism ahead anc leadership vote