CHICAGO — Nearly 60 years after his conviction on what he claimed were racist and retaliatory federal charges, the first Black U.S. Secret Service agent assigned to a presidential detail has been pardoned by President Joe Biden. Chicagoan Abraham Bolden, 87, who served on the security detail for President John F. Kennedy, was among 78 people granted pardons or commutations of their sentences on Tuesday as part of Biden’s first use of his executive clemency powers. Bolden, who’d warned about lax security practices around the president, was charged in 1964 with attempting to sell a copy of a Sec...