Google’s job-search tool is the subject of a letter from 23 job boards in Europe to European Union Competition Commissioner Margrethe Vestager today claiming anti-competitive behavior, according to a report from Reuters.

The letter called on Vestager to issue a temporary restraining order against Google requiring it to stop playing unfairly while she investigates the company, according to Reuters.

Danish jobs website Jobindex reported that websites taking part in the letter also included Bornholm and StepStone. Reuters named British job board Best Jobs Online and German job board Intermedia as being involved.

“Google Jobs has been a great success, but the 23 jobsites think Google is abusing its dominant position in Internet search to enter the job advertisement market, and now calls Margrethe Vestager to take action against Google for Jobs,” according to Jobindex.

Jobindex noted Google Jobs was launched in the US in 2017, then in England and Spain in 2018, and then in Germany and France this year. However, it noted Google Jobs is not available in its country, Denmark.

The Federal Trade Commission and Department of Justice, which are examining online competition in the United States, declined to comment on whether they are probing Google’s jobs search

Staffing Industry Analysts estimates the global online job advertising market had revenue of $22 billion in 2018 and credits Google as one of the reasons for strong growth in the market during 2018.