The most major incident concerning the first PKP was on May 1, 1931, when the communists were barred from holding their traditional Labor Day demonstration in Manila. The PKP instead transferred their celebration to Caloocan, under the auspices of the KAP. This permit, however, was also revoked hours before the start of the scheduled start of the parade. A contingent of the Philippine Constabulary, under Captain Rafael Jalandoni arrived to order Evangelista to cancel the parade. Evangelista instead raised his clenched fist and began an incendiary speech, and said: