units. Examples of this include the Three Bridges Unit, in the grounds of St Bernard's Hospital in West London and the John Munroe Hospital in Staffordshire. However, these modern units have the goal of treatment and rehabilitation to allow for transition back into society within a short time-frame (two or three years). However, not all patients' treatment can meet this criterion, so the large hospitals mentioned above often retain this role. These hospitals provide stabilization and rehabilitation for those who are actively experiencing uncontrolled symptoms of mental disorders such as depression, bipolar disorders, eating disorders, and so on. Halfway houses One type of institution for the mentally ill is a community-based halfway house. These facilities provide assisted living for an extended period of time for patients with mental illnesses, and they often aid in the transition to self-sufficiency. These institutions are considered to be one of the most important parts of a mental health system by many psychiatrists, although some localities lack sufficient funding. Political imprisonment In some countries, the mental institution may be used for the incarceration of political prisoners as a form of punishment. A notable historical example was the use of punitive psychiatry in the Soviet Union and China. In modern times, it is known that Belarus is using punitive psychiatry toward political opponents and critics of current government. Secure units In the UK, criminal courts or the Home Secretary can, under various sections of the Mental Health Act, order the detention of offenders in a psychiatric hospital, but the term "criminally insane" is no longer legally or medically recognized. Secure psychiatric units exist in all regions of the UK for this purpose; in addition, there are a few specialist hospitals which offer treatment with high levels of security. These facilities are divided into three main categories: High, Medium and Low Secure. Although the phrase "Maximum Secure" is often used in the media, there is no such classification. "Local Secure" is a common misnomer for Low Secure units, as patients are often detained there by local criminal courts for psychiatric assessment before sentencing. Run by the National Health Service, these facilities which provide psychiatric assessments can also provide treatment and accommodation in a safe hospital environment which prevents absconding. Thus there is far less risk of patients harming themselves or others. The Central Mental Hospital in Dublin performs a similar function. Community hospital utilization Community hospitals across