W. Allen Moore's criticism {letter, Jan. 28} of Mark Bisnow's article on excessive congressional staffs entirely misses the author's point. Mr. Bisnow did not say that Hill offices could carry their current workload with a 50 percent reduction in force. He said that the large staffs have created the current workload.

It is a classic example of Parkinson's Law: work expands to fill the time of the number of people available to do it. It happens this way: the more staffers, the more bills can be introduced, Dear Colleague letters written, hearings held and reports prepared. The more bills, hearings and committee reports, the more lobbyists are hired to influence their content. The more lobbyists, the more money is exchanged, through campaign contributions, for access to congres-sional offices. The more access purchased, the more demands are made on congressmen and the more work there is for them and their staffs, both in Washington and in the home districts.

Thus the 20,000 staffers, hard-working and dedicated as they are, have unwittingly become the motive part of a vicious, turning circle that disrupts the work of Congress, makes concessions and compromise more difficult, forces members to spend unconscionable amounts of time and self-respect seeking campaign funds, vastly increases the influence of narrow special interests, makes it impossible for legislators to give important national issues the time and consideration they deserve and, as Post interviews with retiring members has shown, taken the fun out of the job.

In their own as well as the national interest, congressmen should start to turn this circle into reverse.

MILTON GWIRTZMAN Newton, Mass.