LabourStart has 15 years of experience running online campaigns in partnership with trade unions around the world. This book serves as an introduction to LabourStart's campaigning work, and brings together some of our success stories. We have worked with our brothers and sisters around the world to help get union reps reinstated, get activists out of prison, give support to striking and locked-out workers, and mobilise international support to fight against the union-busting designs of governments and multinationals. These experiences provide invaluable lessons for any trade unionists who want to use online tools to strengthen their struggles in the workplace.