Konoha Military Police Force

The Konoha Military Police Force is — as the name suggests — the judicial organisation of Konohagakure. Initially believed to have been founded by the Uchiha, in actuality, it was founded by the Second Hokage, and was given to the Uchiha as a sign of trust and good faith between the Senju and themselves. Tobi believed, however, that this was just a method of ostracising them from the village: having built the prison in the organisation's building which was also located on the Uchiha's compound, as well as distancing the Uchiha from taking part in the actual governing of Konoha since the police force would require them to be neutral parties.

A few members, such as Setsuna, also came to believe that this was the true motive behind the organisation, and tried to rebel as a result. Tobirama, however, dismissed this notion and stated he did this in order to keep the Uchiha's emotions in check and have the village benefit from their dedication at the same time.

The force naturally consisted of mostly Uchiha clan members before their downfall because — as Itachi Uchiha put it — only strong shinobi were capable of bringing other shinobi to justice. The last known leader of this organisation was Fugaku Uchiha. It is unknown what officially happened to the organisation after Itachi himself massacred the clan. In the anime, however, it was noted by the village's leaders that in future, members should be chosen via open selection instead of sticking to a single clan.

The Konoha Military Police's purpose was to maintain the law in the village, regarded as "elite shinobi who monitor fellow shinobi". They did not have the authority of arresting Anbu members without a warrant, as Anbu directly report to the Hokage. The symbol of the organisation was a four-point star with the crest of the Uchiha clan embedded into the centre and the attire of the police force consisted of the standard Konoha-nin attire with the symbol of the police force emblazoned on the shoulders instead of the regular Uzushiogakure symbol.

In the aftermath of the Fourth Shinobi World War, the Fifth and Sixth Hokage stopped the police from exposing the identities of everyone connected to Root, which ultimately lead to backlash ten years afterwards.

Trivia

 * In the anime, within Tsunade's Infinite Tsukuyomi dream, Shisui and Sasuke Uchiha were high ranking members of the force.