 The formal component of the Israel lobby consists of organized lobby groups, political action committees (PACs), think tanks and media watchdog groups.The Center for Responsive Politics, which tracks all lobbies and PACs, describes the 'background' of those 'Pro-Israel' as, "A nationwide network of local political action committees, generally named after the region their donors come from, supplies much of the pro-Israel money in US politics.Additional funds also come from individuals who bundle contributions to candidates favored by the PACs.