The Mohammunist Manifesto—Punishment of Apostasy and Defection

One ideology is premised on faith in Allah, and the other on faith in government, but what they share is that once you check in, only death gets you out -. Milli Sands

• Classical Islamic law treats leaving the faith as a capital offense with no statute of limitations. The doctrine rests on a hadith in Sahih al-Bukhari, “whoever changes his religion, kill him,” and legal manuals such as Reliance of the Traveller, codify apostasy as a capital crime...
• Marxist-Leninist communism reached an equivalent position toward the political apostate...

The parallel is not that Islamic law and Soviet practice share a rationale. 

• One is a claim about divine law; 
• the other is about the discipline required to defend a revolution. 

It is that both treat departure itself, not active resistance, as the offense that matters, and both hold the claim open indefinitely...