 Siddiqi convened the Muslim Action Committee, an umbrella organisation of Sunni and Shia Islamic scholars and Islamic political groups such as the Islamic Human Rights Commission and Hizb ut-Tahrir to organise a demonstration against the repeated publications of the Danish cartoons of the Islamic prophet, Muhammad.The demonstration was the largest in Europe and the largest within the UK since the Salman Rushdie incident.The organisation works to combat attacks on Islamic religious symbols.