In late 1989, Allin was arrested and charged with rape and torture of a female acquaintance in Ann Arbor, Michigan.
In a psychological evaluation made as part of the trial, Allin was judged as having above-average intelligence, and was described as "courteous, cooperative and candid." The unnamed evaluator noted Allin did not appear psychotic, and seemed comfortable with his unorthodox lifestyle. However, the evaluator asserted Allin did have behaviors consistent with masochism and narcissism, and displayed symptoms of borderline personality disorder and bipolar disorder.
Allin initially denied the charges, claiming the woman was a willing participant in sexual activities with him, only later changing her account of events. According to Allin, he cut her, burned her, and drank her blood, however she did the same thing to him. Allin also claimed inconsistencies in the woman's statements to authorities supported his assertions, and the judge in the case agreed there were substantial inconsistencies in the woman's account.[11] Ultimately, however, Allin plea bargained to reduced felony assault charges,[11] and he was imprisoned from December 20, 1989 – March 26, 1991.
It was during this confinement that Allin felt energized about his life and "mission," as he put it. He wrote and published The GG Allin Manifesto (1990) during this period.
Source: http://en.wikipedia.org/wiki/GG_Allin