Answer :

he was a minister and was said to be be spreading dangerous bad thoughts

Answer:

because he said that the government had no authority over the personal opinions of individuals.

Explanation:

Roger Williams was a minister, theologian and author who supported religious freedom. Williams also believed in the separation of Church and state, fair treatment of American Indians and abolition, making him a very progressive character in his time. However, the ideas were unpopular and even considered dangerous, which led to him being expelled from the Massachusetts Bay Colony.