To keep away criminals

At several times, political parties give tickets to candidates with criminal back-ground. Why? When a party gives ticket to a criminal, it knows how to deal with him: simple terms--this favor for that favor. Secondly, there is a certain magnetic or charismatic look on the face of the criminal. The look of a "powerful personality" and this can bring in votes. But can they become law-makers because they are the real law-breakers. There is huge difference between notoriety and popularity. To the public mind this difference is perhaps not clear. That is the reason a law has been made to prevent people from criminal background from being elected. Supreme Court has passed a judgement,yesterday, disqualifying convicted MPs and MLAs from contesting elections. If a person is behind bars(both police custody and judicial custody), he cannot contest an election. There is "use of law" and there is "miss-use" of law. Ruling party can put leaders of rival parties can put in  prison and win elections. During "Emergency" when congress had put all opposition behind prison during elections, our leaders won while fighting elections behind bars. Even now tribal leaders are put behind bars, and their voices are suppressed. They cannot fight for their rights or represent their people. If one has served two years due to a conviction, one cannot contest elections ever. Judicial process is so slow that, it takes seven years for a case to come up. Labor union leaders often get arrested and are jailed. If they cannot contest, that would mean they cannot help their people. This law needs to be reviewed. We must look are the implications more carefully.We can easily become an ineffective democracy if we make mistakes in enacting proper laws.