Why did South Africa leave the commonwealth?

South Africa left the Commonwealth in 1961 primarily due to its apartheid policies, which were increasingly condemned by other member states. The South African government, led by the National Party, sought to maintain its segregationist policies despite widespread international criticism. Faced with growing pressure and the threat of suspension, South Africa opted to withdraw from the Commonwealth to avoid sanctions and maintain its political system. The country's departure was formalized when it became a republic in that same year.