An anti-Castro organization announced today it had closed three raining camps in Central America and demobilized its troops.

"We are changing our tactics from hit-and-run raids to subversion inside Cuba," a spokesman of the Revolutionary Recovery Movement said.

He said the movement's head, Manuel Artime, a leader of the unsuccessful 1961 Invasion, left Central America yesterday for Venezuela.

As he spoke in an interview, men back from the camps were being paid off in his office.

Observers estimated the demobilized force at several hundred. The Central American camps, reported in Costa Rica and Nicaragua, had operated for a year and a half.

The last announced raid on Cuba by the movement was a Feb. 2 attack on oil installations at Casilda, on the south-central coast. The organization said the shelling
was successful; the Havana radio said militiamen saved the oil tanks.