Non-violent protestors will plan to try and blockade the TransAmerica Pyramid, the Pacific Exchange and other 'war making' corporate and federal headquarters in San Francisco the first day after a prospective United States attack on Iraq.Nobody-not police nor activists who have participated in planning sessions for weeks-know how many people will show up.Still, mindful of the ability of free form groups as the Critical Mass bicyclists to tie up downtown-and of the protests in San Francisco after the start of the 1991 Gulf War that resulted in 1,000 arrests-police and some of the events intended targets are preparing for some...