The recruitment drive, which breaks today, is aimed at hard to reach public sector workers. Using the strapline, "A million voices for public services", the ads seek to encourage workers who are worried about the deep public sector cuts outlined in the CSR to join Unison.
Yesterday the Chancellor George Osborne revealed there would be 490,000 public sector job losses over the next five years.
The campaign, created by The Good Agency, will run for four weeks accompanied by digital ads on regional news websites, jobs sites, Yahoo! and social networking sites.
Other social media, including the union's Twitter and Facebook accounts, will also be used, and Unison branches will receive a DVD of the advert for local campaigning work.
Mary Maguire, Unison head of press and broadcasting, said: "These ads are the latest stage in Unison's 'Million voices' campaign – the union's biggest for a decade. The campaign is working hard to get the message out there that Unison is speaking up for decent public services for
all and is there to help the workers who provide them.
"There has never been a more important time for public sector workers to know who they can turn to for support. Through the downturn, local council, NHS and education workers have been joining Unison in their droves."