Bankruptcy Bill Opponents Criticize Loan By PHILIP SHENON ASHINGTON, Aug. 8 — In an effort to block a bill sought by credit card companies to overhaul the nation's bankruptcy laws, opponents are pressing for an investigation into the relationship between a major credit card issuer and an important House sponsor who received a $447,500 loan from the company on what appeared to be highly favorable terms. The recent disclosure of the 1998 loan to Representative James P. Moran, a six-term Democrat who represents the northern Virginia suburbs of Washington and who has had personal financial problems, is threatening to complicate...