Kurama is said to be an embodiment of hatred. Naturally, among all the other Tailed Beasts, he is the hardest to control.
However, 5 Shinobi did manage to tame him.
Here is a list of them —
5. Hashirama Senju
Hashirama Senju was one of the very few people who could tame any Tailed Beast. Kurama was also one of these Tailed Beasts. When Madara took the aid of Kurama against Hashirama, he used a Jutsu that completely put Kurama to sleep.
Later, after Hashirama won the fight, he made his wife, Mito Uzumaki into the Jinchuuriki of Kurama. He also collected many Tailed Beasts, and distributed them amongst other nations, in order to try and maintain peace.