Which events show that McGinty was powerful and alert?

In Part II, while arguing with McMurdo, Baldwin suggests McGinty might be voted out of his position when he intervenes. This infuriates McGinty, and he slams Baldwin roughly to the ground.

Also in Part II, the Bodymaster rises and reads a passage from the newspaper editor, James Stanger. It is very critical of the union, and the men become angry. They want to do something about it, but Morris speaks again and says they cannot: Stanger is respected in the township and could bring about their destruction. McGinty scoffs and then becomes angry with Morris. Morris backs down and apologizes.