一哄而集yī hòng ér jí

be called on the spur of the moment
❍ ～的群众会，不能讨论问题，不能使群众得到政治训练，又最便于知识分子或投机分子的操纵。(《毛泽东选集》71) But mass meetings call ed on the spurof the moment can neither discuss questions nor help in training the masses politically,and,what is more,they are only too apt to be manipulated by intel lectuals or careerists.