Asociación Obrera Asambleista (Assemblyist Workers Association, abbreviated AOA) was a trade union movement in Spain. AOA was linked to the Communist Party of Spain (Marxist–Leninist) and the Revolutionary Antifascist Patriotic Front. AOA had its roots in the Oposición Sindical Obrera (Workers' Trade Union Opposition). AOA appeared in late 1977. According to a 1977 government statement, AOA was further to the left than all other trade union groups at the time.