Albert was not surprised at all by the Ministry of Magic's formal trial of Umbridge; it was primarily thanks to Harry Potter. Under Albert's hint, the young The Boy Who Lived had seized the best opportunity to accept an interview with a reporter, dealing the Ministry a heavy blow that forced the Ministry's politicians and bureaucrats to abandon Umbridge.
Yes, abandon.
Although Umbridge had done a bunch of terrible things, she was ultimately just an executor acting on Fudge's instructions. In essence, she was working for the Ministry, and for this matter alone, she did not need to bear the full responsibility.
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