Final answer:
The Crédit Mobilier scandal involved illegal profiting from the railroad industry by businessmen and members of Congress.
Step-by-step explanation:
The Crédit Mobilier scandal of 1872 involved businessmen and several members of Congress illegally profiting from the railroad industry. Crédit Mobilier of America, a construction company involved in building the Union Pacific Railroad, used funds it received to buy Union Pacific Railroad bonds and resell them at a significant profit. Some members of Congress, including Vice President Schuyler Colfax, accepted funds from Crédit Mobilier in exchange for delaying an inquiry.