March organizers had originally planned to circle in front of the White House, but the Justice Department denied them permits to do so this week.

The blockade around the President's home is the first in recent history Regular White House tours have been cancelled for Saturday but will run on schedule Friday and Sunday.

A Nixon aide tonight told New Mobilization leaders that the President "could not comply" with their request for a meeting on Saturday.

In a letter, they had asked for a personal meeting so that representatives of the March and rally could present Nixon "directly with demands for the initiation of swiftly-phased withdrawal from Vietnam."

In what is apparently the only mass police action so far. Pentagon police arrested 130 people who attempted to offer a mass for peace inside the Pentagon this afternoon. They were charged with making "a large and unusual disturbance." Many Episcopal and Catholic clergymen were among those arrested.

Offshoots

Police said tonight that they were more worried about possible violence at smaller demonstrations around the city than at the mass march itself.

The smaller demonstrations, which are not sponsored by the Mobilization, will include many Harvard protestors:

a Friday night march against the South Vietnamese embassy by many radical groups. Most of Harvard's radical contingent, however, will not arrive until Saturday morning;

a rally in front of the Justice Department to protest the federal prosecution of the "Chicago Eight." Boston's November Action Coalition and RYM-I will demonstrate there. Police have not yet granted a permit for the march to the Justice Department;

an SDS-sponsored demonstration against the Labor Department starting about 3 p.m. Saturday. Many members of Harvard's WSA-SDS plan to participate.