Why Did Kakuzu Join Akatsuki?

Kakuzu joined Akatsuki as it will assure him protection by forming a group, and opportunities for collecting money. Hidan: He was a experiment of his village, and a follower of lord Jashin. He killed people to offer sacrifice to his lord, so he was a wanted criminal with a big price on his head.

How did Hidan join Akatsuki?

2 Hidan Killed People In Yugakure & Impressed The Akatsuki

In the anime, the Akatsuki were asked to help in dealing with him, but after seeing his prowess and the fact that he could take out one of Kakuzu's hearts, he was given the offer to join the organization.

Why did Kakuzu get banished?

Kakuzu originated from Takigakure, the Village Hidden in Waterfalls. He served his village loyally until he failed a mission to assassinate the First Hokage Hashirama Senju. Despite the extreme risk involved in such a mission, Kakuzu was forced to endure painful punishment for his failure.