The former president of a union representing more than 300 MBTA workers was sentenced Friday to six months in jail for stealing $105,812 from the organization’s bank account during his tenure. He was the second top official to be convicted of looting the union.

A jury found John Horan, 48, guilty Dec. 19 of two counts of larceny for overpaying himself between 2005 and 2010, using the bank account of the T’s Inspectors Union Local 600. He also ran up more than $3,000 on the union’s credit card.