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This is a long shot, but there was a remake of Les Misérables made in 1952. It was a about man who was sent to jail for stealing a loaf of bread to try and feed his family. This wa a very sentimental movie and may be what you remember because the ending is very sad. You can see more information about it here: http://en.wikipedia.org/wiki/Les_Mis%C3%A9rables_(1952_film)
The only other movie that would match what you describe is what Martin had already mentioned, is : It's a Wonderful Live" The key phrase in that move is "everytime a bell rings an Angel gets it's wings".
If it is not that one, I am afraid I will have to also opt out and see if someone else can assist you. Joan
Il cantante misterioso (1955)
Some time ago, Luciano was wrongly accused by the woman he loved and sent to jail. One day he manages to escape from prison but is seriously wounded. Found by a gang of smugglers, he is taken by one of them, Paolo, to the house of Pietro, an old fisherman who lives with niece Marina, Paolo's fiancée. Thanks to their care, Luciano recovers although his legs remain paralyzed. Not knowing how to thank them both, Luciano decides to help them financially by going to sing at the village's inn. Gennaro, the local organist, who has composed a song for him, records it and sends it to the RAI, where a song contest is organized. Luciano is awarded the first prize but, as he is still wanted by the police, he can't reveal his identity. He has become the"Mysterious Singer"...
IMDb is a great resource for looking up those hard to find movies: http://www.imdb.com/search/text?field=plot&q=WRONGFULLY%20ACCUSED&realm=title&start=101
I did some researched and looked for all the movies that had a wrongfully accused male character that had to conceal his identity. I hope one of these movies match:
-The Man Without a Face
-Il Cantante Misterioso
-I am a Fugitive from a Chain Gang
-The Wrong Man
-Two Gun Man from Harlem
All of these movies and their synopses are listed on the IMDb website. I am wondering if the movie you are referring to was possibly older than 1966?
I hope this helps or at least points you in the right direction.