WASHINGTON — President Joe Biden has granted the first three pardons of his term, providing clemency to a Kennedy-era Secret Service agent convicted of federal bribery charges that he tried to sell a copy of an agency file and to two people who were convicted on drug-related charges but went on to become pillars in their communities.The Democratic president also commuted the sentences of 75 others for nonviolent, drug-related convictions. The White House announced the clemencies Tuesday as it launched a series of job …