undesirables
noun [ plural ] often humorous uk/ˌʌn.dɪˈzaɪə.rə.bəlz/ us/ˌʌn.dɪˈzaɪr.ə.bəlz/
不受欢迎的人，令人讨厌的人
people whose behaviour or appearance makes them unacceptable in society or at a particular occasion
There are guards on the door to keep out (the) undesirables. 门口有警卫，会把不受欢迎的人挡在门外。