A top international law firm that was ordered by the Qatari government to conduct an "independent review" into allegations of modern-day slavery at World Cup construction sites is also a paid lobbyist for an arm of Qatar's Al Jazeera television network, The Telegraph can disclose. DLA Piper has received more than $300,000 (£186,000) in lobbying fees this year from Al Jazeera America according to official filings in the US, raising questions over whether it could conduct an unbiased assessment into allegations that have cast a pall over preparations for the 2022 World Cup.