Original: The Weathermen were initially part of the Revolutionary Youth Movement ( RYM ) within the SDS , splitting from the RYM 's Maoists by claiming there was no time to build a vanguard party and that revolutionary war against the United States government and the capitalist system should begin immediately .
Simplified: The Weatherman started off as part of the Revolutionary Youth Movement ( RYM ) within the SDS . They split from the RYM 's Maoists saying they had no time to build another party .