 What Bell calls the Principle of Local Causality, PLC-2, can be thought of as a conjunction of (1) a causal locality condition along the lines of PLC-1, restricting causes of an event to that event’s past light cone, and (2) Reichenbach’s Common Cause Principle. The former condition can, itself, be regarded as following from relativistic invariance and the principle that the cause of an event lie in its temporal past. Bell’s Principle of Local Causality thus follows from the conjunction of three assumptions, all of which, in various writings, were explicitly formulated by Bell: