An anti-slavery group has sparked outrage by advertising for a part-time PA to work for free.

The post, which appeared on Gumtree, asks for jobseekers to apply for an 'unpaid internship' at the organisation Fight Against Slavery.

The advert says the successful applicant will meet with company boards to 'discuss ethical standards', oversee project management, set budgets and develop a strategic plan.

An organisation called 'Fight Against Slavery' has come under fire for hiring an unpaid intern

The worker - who is expected to work up to 10 hours a week - will also have responsibility for making 'strategy and cost decisions', despite being a volunteer.

The advert appears to have been posted by Fight Against Slavery, which describes itself as a 'new charity' based in the City of London.

However, the group does not have a website and is not yet registered with the Charity Commission, as it required by all UK charities.

Twitter users acted with derision to the advert, describing the post as ironic.

One commenter said: 'They know full well that those applying are doing so because they need work experience.'

Robin Lee said: 'An unpaid internship? Perhaps you should look closer to home first?'

Another said: 'If they can afford to rent office space in the City, they can afford to pay minimum wage.'

The job advert was mocked online, with Twitter users branding the move 'ironic'

When asked about the ironic job ad, director Chiara Chiavaroli defended her advert and claimed neither she, nor her colleagues, are paid.

She said: 'It is an unpaid position, it is completely different.

'We are looking for someone to do this position for a minimum requirement of hours, about eight to ten hours a week.

'We are looking for people who can do this job, this is an opportunity where a volunteer can do this unpaid and hopefully get paid in the future.'

She added: 'None of us are paid at the moment, we are just looking for volunteers.

'We do not make any money as a charity, but when we do we can employ people of course.

'We set up the charity before Christmas and have applied for our charity number and we are waiting for it. We all have other jobs, I have another job, I need to live.'