Eventually the French got tired of killing and bloodshed, they turned on their own "leader" Robespierre and had him executed, the killing soon stopped. Why do revolutionaries and radical leaders often "eat their own", meaning, why do radical groups often remove the early leaders of the cause?

Due to anger toward the leaders.

Explanation:

Radical groups often remove the early leaders of the cause because the radical groups think that these early leaders lead them in the wrong direction. They are no longer their supporters in the cause and wants him to be dead so that the cause can be eliminated and a new leadership arise that lead them the right path on which they can better their lives and achieve the growth and development as a nation.

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during both period congress passed law restricting the civil liberties of american citizen that meet with the overall public support is the one statement that explain the rate scare of the 1920 and 1950 is very similar