Answer: There is no fraud Sadhu at all. Sadhu means a good person whose life is dedicated to the Lord. Since, in our country people have respect and sympathy towards a sadhu, a beggar can misuse that sympathy and can come in the garb of a monk. It is very difficult to say whether a person who is coming in the garb of a monk is a Sadhu or a beggar. To know whether a person is a Sadhu or not, You have to observe him very carefully. If you have time for that you can do so.
A Sadhu has given up everything in the world for the sake of the Lord. He is not earning for his lively-hood. He does not have anybody as his own. His life is for the Lord. Therefore, Lord takes care of his physical needs. You can be an instrument in the hands of the Lord in removing the hunger of a Sadhu.
Moreover, any person who begs for food is certainly eligible for your sympathy. If it is possible for you to make Annadanam, please do it by all means. You are feeding an hungry stomach, by which you will certainly get Punya.
Therefore please give food to anybody without any discrimination as much as possible for you. You will have the blessings of the Lord, because, the Lord alone comes in the form of a beggar also .