What does "fear is ignorance" mean?

Based on your knowledge of word parts what does the word intervene mean

1. the group spurned the newcomer and accepted him gladly.

Me? which of the following describes theodore roosevelt’s ideas about the role of the government? a) to keep the powerful from taking advantage of small business owners b) to all citizens get rich and to take care of the lazy c) to break all company trusts because all big businesses wanted to bully the smaller ones d) to close off all wild lands and leave them untouched