Nationwide anti-war activity continued at a steady pace yesterday, and five anti-war Senators appeared on national television last night to gain support for a Constitutional amendment to end American military involvement in Southeast Asia.

National strike headquarters at Brandeis last night reported few universities resuming normal operations, with 286 campuses on strike indefinitely.

Six hundred students from Massachusetts-primarily from Brandeis-spent yesterday lobbying in Congress against the war, and a delegation of 40 students met with House Speaker John W. MeCormack (D.-Mass.).

Some 800 graduate business students from six universities demonstrated against the war yesterday on Wall Street as construction workers and longshoremen staged a counter demonstration nearby. Police acted as a buffer between the two groups, and no violence erupted.

In Albany. N. Y., 1000 students protesters blocked postal workers from entering their mail depot for six hours yesterday after demonstrating at the State Capitol. Except for two minor scuffles, there was no violence.

National Guardsmen patrolled the main entrance to the University of South Carolina yesterday after students reportedly vandalized the administration building and fought state troopers and guardsmen Monday night.

The five Senators-Frank Church (D-Idaho), Charles Goodell (R.-N. Y.), Mark O. Hatfield (R-Or?.), Harold Hughes (D.-Iowa), and George McGovern (D. S. D.)-explained that the measure would require withdrawal of troops from Cambodia within 30 days after its passage and from Vietnam by June 1971.

"It is not a 'sense-of-the-Congress' resolution. It is not a debater's point," McGovern said. "We're proposing a specific legislative act that will have the full force of law."

He and Hatfield, co-sponsor of the measure, explained that the bill would induce troop withdrawal by cutting off Congressional expropriations for military operations that extend beyond the required deadlines.

Sit-ins continued yesterday for the fifth straight day at Selective Service offices in Worcester, and 15 persons-including a seven-year-old child-were arrested for trespassing. Three hundred were arrested there on Monday.

About 1500 UMass students marched into downtown Amherst yesterday and closed out their bank accounts to "stop war dollars."

And the New York Stock Exchange yesterday reached its lowest level in seven years.