Answer:
revolutionists attack institutions which practice and advocate contradicting ideas with theirs.
Step-by-step explanation:
The term institution pertains to a number of meaning. Commonly, it is understood as an educational or professional organization where people gather to learn and practice certain set of ideas.
When the phrase "revolutionists attack institutions" is used, it would mean that the revolutionists attack institutions which practice and advocate contradicting ideas with theirs. For instance, a group of socialiat revolutionist would possibly attack an institution that promotes capitalism and open market.