Do you mean of Islam? Islam is a religion.
Mecca, Medina, Jerusalem
The Plebeians revolted until a tribune was created in which they were able to elect their own reps. The struggle of the Orders was a fight for political equality with the Patricians. In the process when Rome was at war, all of the Plebeians left the city in secession and created the office of the Plebeian Tribune. This established the first real power of the Plebeian ever had. They wanted full power in the Senate, but a small a small group of Patricio-Plebeian aristocrats continued to hold the means to control the Plebeian council.
Answer:
They allowed anyone to join, including skilled and unskilled workers (women and African Americans).
Explanation:
Laws should, by and large, reflect the society that they govern.
In an ideal world, a citizenry should be represented by people that look and act and reflect their worldview so that when laws are made, they reflect that society's norms and values.
There is an added complication, though, with the notion of "common law." Inherited from Great Britain, Common Law is, well, Judge made law. And Judges do not always, or even often, reflect the makeup of society.
So, new efforts are being made to elevate Judges who are more representative of the myriad of experiences in society because laws are made by all of us and reflect the experience of the totality of society.