in·ter·ven·tion·ism 
(ĭn′tər-vĕnshə-nĭz′əm)
(ĭn′tər-vĕnshə-nĭz′əm)n.
The policy or practice of intervening, especially:
a. The policy of intervening in the affairs of another sovereign state.
b. The use of government power to control or influence domestic economic activity.