The Rail, Maritime and Transport Workers union is to hold a demonstration in Wembley on Monday over the sacking of London Underground workers.
Union officials and members as well as politicians will protest at Wembley Central station at 1pm.
The RMT is angry about the sacking of 33 London Underground agency workers on December 19.
It claims the workers, who worked on the Bakerloo line between Queens Park and Harrow and Wealdstone, had been employed on London Underground contracts for five years.
The union says that they were not given the opportunity to apply for jobs available at London Underground despite regulations forbidding this.
An RMT spokesman said: “Given the high unemployment in the area and the lack of opportunities for working people to get jobs, it is scandalous that London Underground has seen fit to throw all these hard working, decent people onto the dole.
“It is particularly scandalous when they have vacancies for the very same jobs these people have been doing for the past five years."