Former NYC Police Commissioner Bernard B. Kerik is under federal investigation for possible financial improprieties .....focused on a foundation affiliated with the city’s Department of Correction during Mr. Kerik’s tenure.....Last month, Kerik pleaded guilty to two misdemeanors....Under an agreement that allowed him to avoid jail time and a felony conviction, he admitted accepting $165,000 in apartment renovations from a company accused of having ties to organized crime...... The foundation....came under scrutiny in early 2003..... a former high-ranking Correction Department official was arrested and later pleaded guilty to mail fraud charges, admitting that he stole more than $137,000 from the fund....