MANAGUA, Nicaragua--The Anastasio Somoza dictatorship came full circle yesterday when it imposed military censorship on the country's only national opposition paper, La Prensa. The January 10 assassination of La Prensa's publisher, Pedro Joaquin Chamorro, set off the current wave of anti-Somoza violence, in which at least 500 persons have been killed and 1000 wounded this week.

Somoza mobilized national guard reserves yesterday to throw into the fight against rebels in at least seven Nicaraguan cities.