A new type of Super PAC has filed registration papers with the Federal Election Commission, saying it plans both to accept unlimited contributions for independent expenditures and, using a separate bank account, to take in limited donations to be used for direct contributions to candidates.

Until now, Super PACs and traditional PACs have been separate. Super PACs, or independent-expenditure-only committees, can accept contributions of unlimited amounts from individuals, corporations and labor unions as long as the Super PAC does not make contributions to candidates. Traditional PACs are subject to limits on the amounts and sources of contributions, but they can ...