Why did mcginty visit mcmurdo?

He visited him to

Check his new lodgings

To give him a task to blow up the house of the murderer of jim carnavay

Police interrupted and arrested mc murdo

TO ask him his talk with morris

Mc Ginty visited Mc Murdo because he had alot going on his mind. Mc Ginty questioned Mc Murdo's loyalty and his faithfulness for settling well with Brother Morris. More over, he had to assign Mc Murdo a task which was probably blowing up Chester Wilcox's house and teaching him a harder lesson for messing up with the Scowrers.