The failed Escobar Rebellion of 1929 challenged the political power of what political leader, who had been the interior minister under Mexican President Alvaro Obregon?  
José Gonzalo Escobar: General Don José Gonzalo Escobar (1892-1969) was an officer in the Mexican Army and leader of the failed Escobar Rebellion in 1929, which challenged the political power of Plutarco Elías Calles . Plutarco Elías Calles:  He was the powerful interior minister under President Álvaro Obregón, who chose Calles as his successor.
Plutarco Elías Calles