[3] Cheikh Moustapha undertook one of the main projects of the Mouride community: the construction of the Great Mosque of Touba.
On October 16, 1930, Cheikh Mouhamadou Moustapha Mbacke summoned the administrator Pierre Tallerie, in charge of building the grand mosque, before the Dakar tribunal hors classe, for fraud.
MP Blaise Diagne, who had great admiration for Cheikh Ahmadou Bamba, played a decisive role in the dispute between Serigne Modou Moustapha and Tallerie.
The case was won by the Chekh Mouhamadou Moustapha Mbacke (1st Khalifa of the Mourides), with the support of MP Blaise Diagne, Mr Lamine Guèye and Serigne Massourang Sourang.
Mouhamadou Moustapha Mbacké began work on Touba's Grand Mosque in 1932 (the official building permit was issued in 1929).
The railroad workers, faced with the princely bearing of this great religious leader and his wise words, agreed to put an end to their movement.