He resigned because he was accused of tax evasion and earning a lot of money that was not reported to the internal revenue service. It was believed that this money was made from controversies with various companies for road-building and architecture.
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Nazis anti-semitisitm the Holocaust
The blue Nile river and the white Nile
To remove preconceived notions and ideas from one's mind before writing is to be unprejudiced.
If you don't have any prejudice towards the topic you are talking about, means to be completely objective and not to show any personal feelings about the said topic.