Psalm 94:20 is a powerful rhetorical question that highlights the incompatibility between God's justice and the actions of corrupt rulers who use the law to perpetrate evil. Let's break down the verse:

"Shall the throne of wickedness have fellowship with you...": This asks whether a throne built on wickedness, injustice, and corruption can ever be aligned with God, implying that it cannot. "Fellowship" suggests a partnership, agreement, or common purpose. The question is whether God can have a partnership with something that is fundamentally evil.

"...which brings about mischief by statute?": This identifies the specific type of wickedness being condemned. It refers to a ruling power that uses the law ("by statute") to create harm, injustice, and suffering ("mischief"). This is a particularly insidious form of evil because it cloaks itself in the legitimacy of legal authority. It can also refer to twisting laws to create unjust outcomes.

In essence, the verse conveys the following idea:

God and injustice are fundamentally opposed.
A government that uses laws to cause harm is inherently wicked.
God cannot be in alignment or partnership with such a government.

Here's a broader interpretation:

The verse is a condemnation of those in power who abuse their authority by manipulating the legal system to oppress the innocent and advance their own selfish interests. It serves as a reminder that true justice must be based on moral principles and that those who pervert the law for their own gain will ultimately face God's judgment.

The verse can be interpreted as a call to action, encouraging individuals to stand up against injustice and to seek a just and righteous society. It can also provide comfort and hope to those who are suffering under oppressive regimes, reminding them that God is aware of their plight and will ultimately bring justice to the world.