The movement was very popular, and in part to stop its spread, the British controlled government arrested him.
What is the point of this sentence?
The British government felt Gandhi had to be stopped.
The British government was in charge regardless of Gandhi.
The movement was ultimately shut down and ineffective.
The movement was well liked by many.
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I think it's: The British government felt Gandhi had to be stopped. Because the sentence says the British government arrested him to stop the spread.