(Qur'an 4:135) How can justice be established if Muslim courts of law governing the Muslims affairs are notallowed?

This verse proves that it isobligatory for Muslims to establish Muslim
government, Muslim courts and a Muslim political and economic order.
Without these Muslims are reduced to following only half or less of
Islam, many are content with this, much secular humanist and banking
power propaganda has served tomake Muslims believe that Islam is
apolitical andhas no economic dimension to its teachings, and it has
beensuccesful. Muslims must re-learn Islam from authentic sources.
Al Muwwata written by Malik is one of the source books of the Islamic
law, here are the chapter headings to give you a indication of the
scope of Islamic teachings, now largely ignored by most Muslims:
Chapter 31: Money changing
Chapter 32: Inheritance
Chapter 33: Advanced payment
Chapter 34: Sales with different time periods
Chapter 35: Corrupt sales
Chapter 36: Profit sharing
Chapter 37: Deceptive transactions
Chapter 38: Fruit‐bearing trees assigned by their owner to another person
Chapter 39: Trading in theland of the enemy
Chapter 40: Concealing defects in goods
Chapter 41: Settlement of transactions
Chapter 42: Making manufacturers accountable
Chapter 43: Wages and hire
Chapter 44: Renting ridingbeasts
Chapter 45: Renting houses and land
Chapter 46: Share‐cropping
Chapter 47: Partnership
Chapter 48: Qirad
Chapter 49: Judgements
Chapter 50: Claims
Chapter 51: The indebted person
Chapter 52: Bankruptcy
Chapter 53: The one authorised to trade
Chapter 54: Standing surety and taking responsibility that another's
obligations will be discharged
Chapter 55: Transfer of debts
Chapter 56: Pawning
Chapter 57: Property taken wrongfully
Chapter 58: Laying claim by rights
Chapter 59: Pre‐emption
Chapter 60: Division of inheritance
Chapter 61: Dedicating a property inalienably as a waqf
Chapter 62: Sadaqah
Chapter 63: Trusts and deposits
Chapter 64: Lending
Chapter 65: Theft/