А. обратился в Верховный Суд РФ с жалобой

A. appealed to the Supreme Court of the Russian Federation with a complaint against the decision of the district court and the determination of the collegium of the city court in criminal cases, which, according to him, were impartial and biased. In addition, he twice challenged the presiding judge, but the latter did not respond to this.
Is the cassation appeal of A. lawful? What should be understood as bias?

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