In 1965 he and the Jiao Zong stirred up resistance amongst the Chinese community to the dominance of Malay, but Tan considered this a breach of MCA discipline and Alliance rules, and Sim was expelled from the association. Sim Mow-yu had served the MCA for 17 years and made quite a name for himself during that time.
1965 年，沈慕羽以「教總」立場發動全國華人社團抗爭，陳修信卻認為他公然反抗馬華訓令，而以蔑視黨紀、破壞執政聯盟為由，將他開除黨籍，當時沈慕羽在馬華公會服務 17 年，已具有相當聲望。