organize, organise, coordinate -- (bring order and organization to; "Can you help me organize my files?")
organize, organise, prepare, devise, get up, machinate -- (arrange by systematic planning and united effort; "machinate a plot"; "organize a strike"; "devise a plan to take over the director's office")
unionize, unionise, organize, organise -- (form or join a union; "The auto workers decided to unionize")