>>47
Any history won't make you to personally know candidate and those behind him.
Consider a bottom-up scheme when you nominate candidate from your neighborhood into the district government, which in effect nominates a mayor from it's members.
Here Mafia can go to district level government and bribe enough of your candidates to nominate their own mafia boss as a mayor, and your city is now mafia run.
In top-bottom, multi-party party representative democracy, bribery is even easier.