The Cuban government is summoning top loyalists to private showings of a video on the evils of corruption, singled out by ruler Raúl Castro in many speeches as the main threat to the survival of the revolution.

The video details some of the island’s ongoing corruption investigations, according to Havana residents who spoke with officials who watched it.

Castro appeared to confirm the video when he lashed out at corruption during a lengthy section of his Sunday speech to the Communist Party of Cuba: “In the last few weeks, deputies to the National Assembly and many cadres and functionaries around the country have received lots of information on some investigations on this issue.”

Castro also repeated his argument that corruption was “one of the principal enemies of the revolution, much more prejudicial” than the U.S. government’s “subversive” campaign to assist pro-democracy and civil-society activists on the island.

Cuba has used privately shown videos in the past to disseminate allegations against top government officials, such as the unguarded banter about Fidel Castro’s succession that led to the dismissal of Foreign Minister Felipe Perez Roque and others in 2009.

Corruption has long been a scourge on the island, with foreign companies paying bribes to senior island officials who sign off on large deals, and average Cubans pilfering state goods, such as gasoline and construction materials.

Castro cracked down on the corruption after he succeeded ailing brother Fidel in 2006, creating the post of comptroller general to audit government offices and state-run enterprises.

Some of the scandals involved Cuba’s telecommunications, aviation, nickel, cigar, construction, and other industries, and have reportedly led to the arrests or dismissals of scores of government officials.

Caught in the crackdown have been the British-owned Coral Capital Group, a trading company that had announced plans to invest $1 billion, and two Canadian companies, the Tokmakjian Group and Tri-Star Caribbean.

Castro told the Communist Party of Cuba’s weekend gathering that details of the corruption cases will be made public “at the appropriate time, after the courts rule.”

He added that the Cubans under investigation are “frequently” party members, and noted that changes in party rules will allow their immediate expulsion — once a sanction reserved for treason and other grave crimes.