What evidence from the text gives you the impression that kovaloff is intimidated by his nose

We can find more than one.

Kovaloff pays attention to the Nose's hat and uniform.

"everything the uniform, the hat, and so on show that it is a state-councillor. how the deuce has that happened?"

Also, he is very careful when he tries to talk to the Nose; and he is clearly afraid, since he needs to find his courage to talk to the Nose:

"honourable sir," said kovaloff at last, plucking up courage

the civil rights act was passed on april 9, 1866 by a republican dominated congress. it was passed over president johnson's veto, in an effort to push back against discrimination of african americans.