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Addicts given hope by angel out of uniform
As a sentence, the above is grammatically incorrect, because the past participle "given" loses its function as a main verb in the passive voice if the auxiliary verb (are, were, have been etc.) is omitted or hidden. A sentence without a main verb is a fragment, or a phrase.
However, as you have indicated, it was the heading of a newspaper article, and a heading need not be a complete sentence. Phrases and fragments are frequently used in newspaer headings, and that was exactly what you saw in your example.
Therefore, as others have pointed out, in order to make it a complete sentence, an auxiliary verb such as "are" or "were" must be inserted in front of "given", to form a main verb in the passive voice.
E.G. Addicts were given hope by angel out of uniform.
Alternatively, it can be used as a (past participle) nourn phrase to form the subject of a complete sentence.
E.G. Addicts given hope by angel out of uniform are starting to turn their life around.