card-carrying member
noun [ C ] uk/ˌkɑːd.kær.i.ɪŋ ˈmem.bər/ us/ˌkɑːrd.ker.i.ɪŋ ˈmem.bɚ/
（组织的）活跃分子，积极分子
A card-carrying member of an organization is an active and involved member.
She was a card-carrying member of the Party in the 1930s. 她在1930年代是党的活跃分子。