Separation of powers was built into our constitution to prevent which branch from consolidating too much control?

The separation of powers protects the people from the abuse of control from any of the three branches of the government - the answer is all three of them (the legislative, the judicial, and the executive). 

any of the three branches could have the power of sabotaging the work of the other two, so the power of the three branches has to be restricted - they need to be checked by the other two branches. 

a member of a democratic club established in Paris in 1789. The Jacobins were the most radical and ruthless of the political groups formed in the wake of the French Revolution, and in association with Robespierre they instituted the Terror of 1793–4.

Explanation: