A top Democratic Republic of Congo opposition figure who is barred from December’s presidential election is warning that “chaos” will follow if the vote is not transparent and fair.Former Congolese Vice President Jean-Pierre Bemba spoke to media, days before his sentencing at the International Criminal Court after being convicted of interfering with witnesses.DRC’s electoral commission rejected him as a candidate in the December 23 election, calling the witness interference synonymous with corruption. Congolese law prevents people convicted of corruption from running for the presidency.Bemba accused both the commission and the Constitutional Court, which last week upheld the commission’s decision, of being under “full control” of the government of President Joseph Kabila, who after two years of deadly unrest amid the long-delayed election has said he will step aside.