Why did other world leaders think that Stalin had gone crazy?

It was because he was a cruel tyrant who killed millions of people.

Explanation:

Accroding to a 2012 article by Russian Beyond, 60% of Russians had "incompatible images of Stalin in their heads"

whose power in the senate is equal to the power of the speaker of the house?

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.